sailboat under bridge

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The Right Way To Navigate Bridges

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At some point in your travels here and there by boat, you may have to request a bridge opening. Here's how to do it right.

A crowd of boats wait for a timed bridge to open. (Photo: Mel Neale)

Whether you have to deal with bridges only occasionally or every day, you'll probably have to deal with them at least sometimes. If your boat has very little air draft, you may think there's not much to worry about. But there may be, and the issue of whether you're too tall to get under is only one of many. Here's what to expect when your way is blocked by spans of steel and cement with eighteen-wheelers flying overhead.

Barriers To Safe Passage

Obviously, you must avoid bridge pilings and the structure surrounding bridges. But you must also deal with eddies around them, which may affect your steering. Sailboats have particular issues because the wind may change, causing temporary calms or shifts. It is usually imprudent, and often illegal, to use sails to go through a bridge — unless that's your only means of propulsion. The pilings may obstruct vision, which is important regarding oncoming traffic, but also for avoiding small boats that often hang out around the pilings to fish.

Communities often build trailer ramps on one side of bridges. This means that small boats and skiffs may be blithely taking off from behind the pilings, heading into the path of boats coming through the bridge. Whether you're steering around pilings or through a span, all boats must be extra vigilant, using necessary signals and prudent maneuvering. Rules of the Road are very important, not to mention common sense.

Who's On First?

Usually boats must funnel through a particular span of a bridge, which may require opening. Special right-of-way considerations may come into play. For example, if a boat is heading with the current, other boats heading into the current should normally let the boat being pushed come through first. Smaller nimble boats should generally stay out of the way of a large boat with more limited maneuverability. An outboard skiff darting around the bow of a ponderously moving tug and barge may be obscured from view of the pilothouse. This is true anytime, but particularly in areas of restricted maneuverability around a bridge. And what boater can possibly think his engine can never fail at just the wrong time?

Requested Vs. Scheduled

Many bridges must open to let taller boats through. Sometimes these bridges open on request if given proper signal, but many bridges only open at scheduled times. Always signal the bridge for an opening. Signals include horn blasts (usually a long and a short), but most boats call the bridge tender on the VHF. Bridges stand by on channel 9 or 13, depending on location. Call the bridge by its name (e.g., North Landing Bridge, Barefoot Landing Bridge, Seventeenth Street Causeway Bridge). Otherwise the wrong bridge may think you need an opening. Names of bridges and proper VHF channels are best found in updated guidebooks, where you will also find local rules and customs. Be aware that some bridge names may change. For many years, tugs going through the Atlantic Intracoastal Waterway (AICW) swing bridge south of Little River Inlet, South Carolina, called it, melodically, the "Little River Swing" (pronounced "swang.") Now the bridge is named the "Captain Archie Neil 'Poo' McLauchlin Swing Bridge" after a well-known local legend. The captain may be sitting in his favorite establishment watching as you go by.

This sailboat was dismasted by a bridge. Fortunately, no one was injured. (Photo: Mel Neale)

It's often difficult to plan ahead for scheduled bridge openings because typically the current will change in the channel ahead. This is particularly true in areas where inlets or creeks run to larger bodies of water, such as the ocean. A creek may produce current, speeding you along, but as you pass its intersection, the current turns against you. People who simply plug distance to run into a chartplotter are often fooled.

Communication Is Key

Even if the boat ahead of you has requested an opening, you also should request one so that the bridge tender knows how many boats are coming through. We've known bridges to close on boats that haven't properly notified the operator. Often, when the bridge is in the open position, the bridge tender has limited visibility. Going through in a single file line is usually best because boats on the other side may also be coming through and space is limited.

Sometimes a bridge tender will instruct pleasure boats to wait for a tug and barge or other vessels because of that vessel's special needs or space limitation. Pay attention. Keep a VHF tuned to the bridge's operating channel well before you approach the bridge, as well as during the transit, because there may be special issues such as a malfunctioning bridge, a fire/rescue vehicle approaching on the highway, or other problems. If you know in advance, you can slow down and come through when the situation has cleared.

Into The Melee

When you reach a bridge, there may well be a crowd of boating traffic. If the bridge opens only on a schedule or is otherwise restricted (such as bridge work or emergency highway traffic), it is critically important to take into consideration the special maneuvering needs of other boats (including your own) when you're waiting in a crowd. Try to stay clear. For example, often a sailboat will have little control when backing or require a wide turning radius. Large vessels may have very little maneuverability in tight quarters. Often a tug with a barge must simply keep coming, unable to dodge around smaller boats.

Some vessels may have huge windage issues that make steering and positioning very difficult, especially if the wind is blowing across the channel or toward the bridge. Others, such as deep draft vessels, may be susceptible to strong currents pushing them toward the bridge and may need to face away from the bridge into the current or wind until the opening. Then it will have to turn, and there might not be room to do so within its turning radius. And just as boats have different handling characteristics, skippers have different skill levels. We've passed through many bridges over the years, and my favorite tactic is to remain at the end of the line to hopefully avoid trouble. Don't hang too far back, though, because the bridge tender has an obligation to get the highway traffic moving when he can.

To make matters worse, some bridges are situated poorly from a boat operator's perspective. The Wappoo Creek Bridge just south of Charleston, for example, spans a narrow channel that doglegs. The current is immense, and a large boat coming through on a fair tide may have trouble making the turn. And this bridge usually operates on a schedule. Check the charts to get the "lay of the land" long before you approach a bridge.

Watch Out For Power Lines

High-voltage power lines can carry hundreds of thousands of volts across rivers and bays. Power lines that cross navigable waterways are marked on charts with their clearance listed as from the height of mean high water (MHW), which is an average of several years of high tides. If the power lines are near a bridge, their lowest clearances are required to be higher than the bridge. However never take a chance with "close." Floods or surges can diminish the clearance. Also, voltage has been reported to jump from a power line to the mast top even though that mast top may not have actually touched the line. In addition, extremely hot days may cause some sagging, as could wind, lightning, or other damage to the supporting towers.

According to the U.S. Coast Guard, should your boat come in contact with a power line, don't jump into the water. The electrical charge may pass through your boat and electrify the surrounding water. The safest approach is to stay in the boat and avoid touching anything metal. Leave the boat only after it has moved away from the line.

— By Charles Fort

How High Is Too Low

Even if you think your boat's air draft can pass under a bridge, you still may need an opening. The theoretical vertical clearance of fixed bridges on the AICW is 65 feet (except for the 56-foot Julia Tuttle Bridge in Miami). But this is "sometimes." An unusually high tide, flooding from excessive rain, or storm tide can make it less. We've seen sailboats dismasted because they underestimated the clearance. Some sailboats will hang loaded dinghies or heavy jugs of water out to the side on a spinnaker pole and a halyard to cause a heel that will allow them through. (Not a good idea!) Most wisely go out to sea for that part of the passage or wait for sufficiently low water. Other waterways besides the AICW have different height restrictions. For example, 55 feet for the Florida Gulf Intracoastal Waterway and 49 feet for the Okeechobee Waterway.

Extra high tides may mean trouble for tall-masted ­vessels. (Photo: Mel Neale)

There are usually tide boards at each bridge that show the vertical clearance at the center of the span (or wherever it's the highest), but sometimes these are damaged. It's difficult to "eyeball" vertical clearance. Standing on your deck and looking up creates an optical illusion making the overhead span seem much closer. Sometimes bridge tenders will help, but often they aren't allowed to because of the liability. If you can't clear the span and you're too close to the steel girders, the current or wind may prevent you from stopping in time.

Trawlers and other "short" boats may have a similar problem with a lower bridge, which they would normally need to open. If that bridge is timed, they may want to get under anyway and this requires absolute knowledge of your boat's air draft and the bridge's vertical clearance. The maximum vertical clearance of many bridges is typically at or near the center of the center span, not off to the side, although there are some significant exceptions to this. Bridge tenders sometimes tell captains to lower antennas and outriggers, etc. Requiring an opening just because you don't want to lower your antenna or outrigger isn't lawful.

It Takes Us All To Tango

When a bridge tender does try to be helpful or give you advice, remember that you're the skipper of your boat and are normally ultimately responsible. Many tenders have little actual experience running boats. Some also will become impatient with ignorant or impolite boaters. However, these incidents are not the rule and are often exaggerated. Bridge tenders must juggle many interests, all with the demands of the situation, which can include winds, tides, storms, currents, and poorly trained skippers. If you do have a problem, the U.S. Coast Guard has a "Bridge Office" in each district that you can contact. Typically bridge tenders are anxious to help, many going out of their way to do so. Some are boaters themselves. It takes all of us to make it work.

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Bridge Clearance

Do you ever need to know the tide heights if you're not crossing a shallow bar? Maybe.

It could be that problems arise above the water. A low bridge can block passage for fly-bridge cruisers and sailboats on high tide, yet let them pass with space to spare on low. Sometimes even runabouts can be blocked by low-hanging roadways.

You obviously need to know your boat 's bridge clearance if you navigate anywhere that passage beneath one of these structures is common. The bridge clearance (BC) refers to the height from the waterline (where the surface meets the hull) to the highest point of any structure on the boat, including the mast, tuna tower, or outriggers. (If your radio antennas and riggers fold down, you don't have to measure them in the equation.)

Boat Bytes_

It's always best to punch around in the backwaters on a rising tide, and to head back for deeper water shortly before the tide peaks and starts to run back out. That way, if you go aground inside, the rising water gives you a good chance to get off anc escape; while if you ground on falling water, you're stuck until the next incoming tide.

Boater-ese.

Bridge clearance (BC) is

the distance from a boat's waterline to the highest point on the topsides. It indicates the height of a bridge under which a boat can pass.

Bridge clearance is listed on marine charts, with the height above mean high water given. So, if you want to pass under a bridge that has 20-foot listed clearance with your sport-fisherman boasting a BC of 19'6'', you aren't going to be able to get through at the peak of a spring tide that's a foot taller than normal high tide (more on spring tides later in this chapter). On the other hand, you can get through that bridge with a 19-foot listed clearance on the bottom of a -1.0 low.

Bet You Didn't Know

In most areas there's a normal progression through four tides, but some days have only three tides. How can this be?

As the 50-minute-per-day regression takes place, the P.M. tide gradually advances past midnight, thus leaving one 24-hour period without four tides, even though the tidal movements maintain their steady procession.

Continue reading here: If Your Boat Springs a Leak

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Readers' Questions

How to determine if a bridge should be tall or movable to allow ships to pass under it?

There are several factors that need to be considered when determining if a bridge should be tall or movable to allow ships to pass under it. Height of the ships: The height of the ships that will be passing under the bridge is one of the most important factors to consider. The bridge needs to be tall enough to accommodate the highest ships that will be using the waterway. Frequency of ship traffic: If the waterway sees a high volume of ship traffic, it may be more practical to build a movable bridge that can easily be raised and lowered to allow ships to pass through. This can help to reduce congestion and delays for both road and water traffic. Cost and feasibility: Building a tall bridge may be more costly and require more engineering and construction expertise than building a movable bridge. The cost and feasibility of each option need to be carefully considered before a decision is made. Environmental impact: Building a tall bridge may have a bigger impact on the surrounding environment compared to a movable bridge. Environmental factors such as wildlife habitats, water quality, and scenic views need to be taken into account. Regulatory requirements: There may be specific regulations and requirements that dictate the design and construction of bridges over waterways. These regulations may specify the maximum height of the bridge, the types of ships that need to be accommodated, and other considerations that need to be taken into account. Ultimately, the decision to build a tall or movable bridge will depend on a combination of these factors and will require careful planning and consideration to ensure that the bridge meets the needs of both road and water traffic.

What is the maximum bridge clearance of a 2002 sea ray 360?

The 2002 Sea Ray 360 has a maximum bridge clearance of approximately 18 feet 10 inches or 5.7 meters.

What clearance does a bridge need for boat sto sfaley pass?

The clearance required for a bridge to safely pass boats will vary depending on the size and type of boats that typically travel in the area. Typically, for small pleasure boats and small commercial vessels, a clearance of at least 15-20 feet is usually sufficient. However, for larger vessels such as sailboats and yachts, a clearance of at least 50 feet or more may be needed. It is important to consider the height of the masts and antennas of the boats that will be passing under the bridge when determining the necessary clearance.

How tall is the bridge between cross lake and rush lake for boats?

I'm sorry, but I couldn't find any specific information about a bridge between Cross Lake and Rush Lake in my database. Could you please provide additional details such as the location or any other names associated with the bridge?

What is the clearance under the boston university bridge?

The clearance under the Boston University Bridge is approximately 21 feet.

How tall is a bertram with a flybridge in feet?

The height of a Bertram with a flybridge can vary depending on the specific model and design features. However, on average, a Bertram with a flybridge may have a height ranging from around 14 to 18 feet.

How to read bridge information sailboat?

To read bridge information on a sailboat, you can follow these steps: Understand the types of bridges: Familiarize yourself with different types of bridges that you may encounter while sailing, such as fixed bridges, swing bridges, lift bridges, bascule bridges, and pontoon bridges. Consult nautical charts: Use nautical charts specific to the area you are sailing in. Nautical charts will provide detailed information about bridge locations, clearance heights, opening schedules, and other relevant details. Identify bridge symbols: On nautical charts, bridges are typically marked with specific symbols. Learn to recognize and interpret these symbols to identify the type of bridge and its characteristics. Note vertical clearance: Pay attention to the vertical distance between the waterline and the bridge structure. This information will help you determine if your sailboat can safely pass under the bridge without any height restrictions. Check the opening schedule: For movable bridges, consult the nautical charts or contact local authorities to determine the bridge's operation schedule. It is essential to be aware of any specific opening times and restrictions to plan your sail accordingly. Use official publications: Utilize official sailing publications like the United States Coast Pilot or similar guides for bridge information. These publications provide additional details such as radio frequencies to contact bridge operators and any special considerations. Listen to VHF radio communications: While sailing near bridges, monitor the VHF radio channels that bridge operators use. They may provide updates on the bridge status, closures or any specific instructions for sailing through. Keep a lookout: Maintain a sharp lookout for any visual signs or signals displayed by the bridge operators, such as lights, flags, or signs. These signals may indicate whether the bridge is open or closed to vessel traffic. Plan your route: Consider the bridge clearances, opening schedules, and other navigational factors when planning your sailing route. Ensure to account for any potential delays caused by bridge operations and adjust your schedule accordingly. Follow navigation rules: When approaching and passing through bridges, ensure you adhere to navigation rules and any instructions provided by bridge operators. Maintain a safe distance and follow any direction to pass safely. Remember, bridge information can change, so it is crucial to stay updated with the latest charts, local notices, and radio communications to ensure a safe and hassle-free sailboat journey.

How tall a ship can fit under the newportpell bridge?

The height clearance under the Newport Pell Bridge, located in Newport, Rhode Island, is approximately 207 feet (63 meters). This gives ships with a height of up to 207 feet the ability to pass under the bridge safely.

What does horizontal bridge clearance mean on a boat?

Horizontal bridge clearance on a boat refers to the measurement of the distance between the waterline and the highest point on the boat that could potentially collide with a bridge or other overhead obstruction when passing underneath it. It is an important consideration for boat operators to prevent damage to the boat and ensure safe navigation in areas with low bridge clearances.

What is the hight of a 50 azimut yacht?

The height of a 50-foot Azimut yacht can vary depending on the specific model and design. However, a general estimate for the height of a 50-foot Azimut yacht would be around 20-25 feet. It is always best to consult the manufacturer's specifications or contact the specific model's seller for precise measurements.

What is the max height of a boat to go under 8.5’ canal bridge coral gables?

The maximum height of a boat to go under an 8.5' canal bridge in Coral Gables is usually around 7.5 - 8 feet. This allows for some clearance between the boat and the bridge to ensure safe passage. It is important to always check the specific bridge clearance height as it can vary depending on factors such as tides and construction.

What is reasonable bridge span length to allow passage of sail boats?

The length of a reasonable bridge span for sailboats can vary depending on several factors, such as the type and size of sailboat, the height of its mast, and the location of the bridge. In general, a bridge span length of around 65 feet (20 meters) is considered reasonable to allow passage for most sailboats. However, larger sailboats with taller masts may require bridges with higher clearances or even drawbridges that can be opened to accommodate their passage. It is important for bridge designers and operators to consider the local boating traffic and ensure sufficient clearance for safe passage of sailboats.

What is the highest clearance under jubilee bridge in highest tides?

The Jubilee Bridge, located in Cornwall, England, has a fixed clearance of approximately 5 meters (16 feet) at mean high water springs. Therefore, the highest clearance under the bridge during the highest tides would also be around 5 meters.

What is max bridge clearance for ships?

The maximum bridge clearance for ships varies depending on various factors including the design of the ship, its size, and the waterway it is navigating. The bridge clearance refers to the vertical distance between the waterline and any overhead structure that the ship needs to pass under, such as a bridge or powerline. In general, larger ships have a lower maximum bridge clearance due to their size and draft. For example, large container ships or oil tankers may have a bridge clearance of around 55 meters (180 feet) or less. On the other hand, smaller vessels like yachts or pleasure boats typically have a higher bridge clearance, usually ranging from 10 to 20 meters (33 to 66 feet). It is important for ship operators and captains to be aware of the maximum bridge clearance to ensure safe passage and avoid any collisions or damage to the ship or overhead structures. Navigation charts, local regulations, and communication with control towers or bridge operators are crucial in determining and maintaining a safe clearance for ships.

How tall are bridges on the interstate?

The height of bridges on the interstate can vary depending on the location and construction standards. Typically, the minimum clearance height for interstate bridges is around 16 feet or 4.9 meters. However, there can be exceptions where certain bridges may have lower clearance heights due to various factors such as road design, geography, or infrastructure age. It is important to note that these measurements may vary and it is always advisable to follow posted clearance signs and height restrictions to ensure safe passage.

What size boat can get under whitten neck bridge nh?

I'm sorry, but as an AI language model, I don't have access to specific data such as the height of the Whitten Neck Bridge in New Hampshire. However, typically, the clearance height of bridges is indicated by signs or local regulations. I would recommend contacting local authorities or boating associations in the area for accurate information about the clearance height of the Whitten Neck Bridge and the size of the boat that can safely pass underneath it.

What foot clearance for a bridge does a new 26 twinvee need?

The foot clearance for a bridge required by a new 26 Twin Vee boat may vary depending on local regulations, construction standards, and the specific design characteristics of the boat. It is recommended to consult the manufacturer's documentation or contact the Twin Vee company directly for accurate information regarding the required foot clearance for bridges.

What is the height above the waterline of a norman 23 motor cruiser?

The Norman 23 Motor Cruiser has a height of approximately 6 feet above the waterline.

How to calculate bridge clerance from vessel?

The bridge clearance is the height of the lowest overhead part of the ship's superstructure above the waterline of the vessel. To calculate bridge clearance, you will need to measure the distance from the waterline of your vessel to the lowest point of your superstructure. Subtract the waterline measurement from the superstructure measurement to get your bridge clearance.

What is the minimum and maximum clearance on the underside of a bridge?

? The minimum clearance on the underside of a bridge is typically determined by the load capacity of the bridge and the height of the bridge deck above the water. The maximum clearance is usually determined by the height of the waterway below the bridge.

What is bridge clearance of a 2006 sea ray 260 when on a boat trailer videos?

The bridge clearance for a 2006 Sea Ray 260 when on a boat trailer is 8' 6".

What is the bridge clearance for a 1981 55ft, sea ranger pilothouse trawler?

The bridge clearance for a 1981 55ft Sea Ranger Pilothouse Trawler can vary depending on which model you have, but in most cases it will be anywhere from 19ft to 21ft.

How high a bridge should be above the river for boats to pass through?

The answer to this question depends on the size of the boats that will be passing through the river. Generally, bridges need to have a clearance of at least a few meters (typically 6-12 m) above the highest expected water level in order to ensure that the boats can pass underneath safely.

Can a sail boat go under the lyndon johnson bridge?

No, sailboats typically cannot travel under the Lyndon B. Johnson Bridge due to its height restrictions. The bridge spans 177 feet above the water, which is too high for sailboats to travel safely underneath.

What size boat can go under the bridge into surfers?

paradise The size of boat that can go under the bridge into surfers paradise would depend on the height of the bridge and the size of the boat. Generally, boats that have a beam (width) of less than 7'10" and a mast (height) of less than 22' can pass beneath the bridge.

Do boats fit uner the ponte cestio?

Yes, boats can fit under the Ponte Cestio, which is a bridge located in Rome, Italy. The bridge has a clearance of around 8.5 meters, which should be high enough to allow most boats to pass underneath.

How to find a boats bridge clearance?

To find a boat's bridge clearance, first take a look at the bridge itself. Get the exact measurements of the bridge and make sure you know the height of the water when you plan to be traveling under it. This will help you determine what your clearance will be. If you are uncertain, contact the bridge operators and inquire. They should be able to provide the height of the bridge, as well as the depth of the water when you plan to pass underneath it. This will help you calculate your exact bridge clearance.

What bridge clearance does a 30 foot sea ray cruiser need?

The recommended bridge clearance for a 30 foot Sea Ray Cruiser is at least 11 feet.

What is the bridge clearance for a nordhavn 64?

The bridge clearance for the Nordhavn 64 is approximately 15 feet.

What is the clearence of the rt 54 bridge in high tide fenwick island?

The RT 54 Bridge in Fenwick Island does not have any specific clearance due to high tide. The U.S. Coast Guard maintains a navigation channel under the bridge that is 15 ft. deep at mean low water and has a vertical clearance of 35 ft. at mean high water.

What is the maximum bridge height clearance for a sea ray sundancer 260?

The maximum bridge height clearance for a Sea Ray Sundancer 260 is 13 feet 0 inches (3.96 meters).

Can a pontoon boat fit under a bridge that is 7'4?

" tall No, most pontoon boats have a bridge clearance of 8 to 10 feet.

What does trans am height mean on a boat?

Transom Amidships Height (TAH) is the distance from the waterline to the top of the transom. This measurement will often be used when choosing the right outboard or inboard motor for a boat.

How tall is average bridge height?

The average bridge height varies significantly depending on the type and purpose of the bridge. Generally speaking, the average height of a highway bridge is around 15 meters (50 feet), while a railway bridge averages around 21 meters (70 feet).

What is the boat clearance on the sundance bridge, southport?

The bridge clearance for most boats is 25 feet.

How hight is the sundale bridge for a fly ridge boat?

The Sundale Bridge has an Air Draft of 24 feet 6 inches.

How do you figure out bridge clearance of a boat?

The best way to calculate the bridge clearance of a boat is to measure the height of your boat's mast or highest point from the waterline to the top of the object. This should be done while the boat is in the water and not while it is out of the water, as the measurements may vary. Then, subtract that measurement from the bridge's clearance height, as posted on a bridge marker near the bridge itself. The difference between mast height and the posted clearance height is your boat's bridge clearance.

What is height for clearance of flybridge boat sundale bridge southport?

The clearance for the Sundale Bridge in Southport is 6m (19.68 feet).

How to read bridge high for boat?

To determine the clearance height under a bridge for a boat, you can follow these steps: Obtain the bridge clearance information: Research the specific bridge you want to pass under and find its official clearance height. This information is usually available in boating charts, guidebooks, or online resources. It is important to note that bridge clearance heights can vary depending on factors such as tides and water levels, so you might need to consider these variables as well. Determine your boat's height: Measure the height of your boat from the waterline to the highest point on your vessel. This might include antennas, masts, or other protruding elements that increase the overall height. Make sure to measure accurately and account for any potential changes due to additional weight on board. Adjust for tides and water levels: Considering the current conditions of the water level, calculate if it will affect the boat's vertical clearance. If the tide or water level is significantly higher than usual, it might decrease the bridge clearance. Take the time to research tide tables or contact local marinas for information on water level fluctuations if needed. Compare boat height with bridge clearance: Subtract the height of your boat from the bridge clearance height, taking into account any adjustments for tides or water levels. The resulting figure will indicate the amount of clearance space available. Ensure that there is sufficient clearance for your boat to safely pass through without any obstructions. It is crucial to exercise caution when passing under bridges to prevent collisions or damage to your boat. Always double-check the provided clearance information and plan your routes accordingly. Additionally, check for any potential clearance restrictions due to overhead power lines or other obstructions near the bridge.

How should you pass a fishing boat?

When passing a fishing boat, you should slow down and ensure that you pass at a safe distance. You should also use appropriate signal lights and sound signals to indicate your intentions. Additionally, give the boat's occupants plenty of time to respond before continuing to maneuver your vessel.

How high is a 10ft beam , can it get under a bridge?

No, a 10 ft beam cannot get under a bridge. The typical clearance height for a bridge is between 12 and 15 ft.

How to do field bridge measurements in a sail boat?

Field bridge measurements in a sail boat are typically done to measure and determine the performance of the sailboat in various conditions, such as wind speed, direction and strength. The measurements are generally done using a bridge-like instrument known as a field bridge, which is attached to the boat and measures the forces acting on the vessel in the water. These forces can then be used to calculate the speed, direction, angle of heel and other performance parameters. The measurements can be done while the sailboat is at rest or sailing, depending on the type of field bridge measurement being done.

How high is a 28 ft searay above the waterline?

Typically, a 28 foot SeaRay boat will measure about 8 - 10 feet above the waterline when fully loaded.

Are bridge clearances given for high water?

Yes, bridge clearances are given for high water levels. High water levels can affect the clearance underneath a bridge and must be taken into consideration when calculating bridge clearances.

How to calculate bridge clearance for boat?

To calculate the bridge clearance for a boat, you need to take the height of the bridge, subtract the height of the boat, and then subtract the height of the mast.

How high is a typical sail boat above water?

The height of a typical sail boat above water typically ranges from 3-ft to 15-ft, depending on the boat's design and sail configuration.

Is bridge clearance based on high tides or low tides?

Bridge clearance is usually based on the highest expected tidal range in the area.

How high does a bridge have to be for a boat to pass beneth it?

The height of a bridge for a boat to pass beneath it depends on the size and height of the boat. Generally, a bridge should allow at least 15 feet of clearance for boats traveling underneath it.

How do they measue clearance under a bridge?

Clearance under a bridge is typically measured using basic surveying equipment such as a total station or laser rangefinder. A surveyor will measure from the bridge deck to the ground, or from the bridge deck to any other obstacle that the bridge must clear.

How to increase the clearance in bridge?

Increasing the clearance in a bridge involves various considerations and engineering solutions. Here are some possible steps to increase the clearance: Evaluate the bridge: Determine the current clearance and the required increase in clearance. Assess the bridge's structure, age, and load capacity to ensure that it can accommodate any modifications. Modify the roadway: If possible, lower the road surface by excavation or reducing the pavement thickness within the bridge approach areas. This can create more space for the clearance above. Adjust bridge parapets: Parapets are the protective walls on the sides of the bridge. Modifying or replacing them with lower-profile ones can increase the vertical clearance. Modify the bridge deck: Consider increasing the thickness or replacing the bridge deck with a thinner material, which can help raise the vertical clearance. Redesign or replace the bridge girders: Girders provide the structural support for the bridge deck. If replacement is feasible, consider using girders with a shallower profile to increase the clearance. Modify the bridge abutments: Abutments are the supports at the ends of the bridge. Adjusting or replacing them with shorter ones may allow for a higher clearance. Use specially designed arches or trusses: In some cases, adding arches or trusses under the existing bridge can increase the clearance without significantly altering the structure above. Divert or relocate the roadway: If feasible, consider modifying the roadway alignment to bypass the bridge completely or relocate it to a nearby location with better clearance. Seek professional guidance: Consult with bridge engineers and professionals to assess the bridge's specific conditions, evaluate potential solutions, and ensure compliance with applicable regulations and safety standards. Always keep in mind that altering a bridge's clearance requires professional expertise and adherence to safety regulations and standards.

What does 2.2m height clearance mean?

2.2m height clearance means that the area has a minimum clearance height of 2.2 meters. This could refer to the clearance of a doorway, ceiling, or any other space.

What is the average height of a bridge from the water?

The average height of a bridge from the water is approximately 20 meters (65 feet).

What do you need to know when passing under a river bridge boaters test?

When preparing to pass under a river bridge during a boater's test, there are several important things you need to know, including: Bridge clearance: You must know the clearance height of the bridge to ensure your boat can safely pass under it without hitting any part of the structure. This information is usually posted on a sign or marker near the bridge or in nautical charts. Boat height: Measure the height of your boat from the waterline to the highest point, such as an antenna or mast. Compare this measurement to the bridge clearance to determine if your boat can safely pass through. Antennas and equipment: Take into consideration any antennas, equipment, or other protruding features on your boat that could increase its overall height. Include these items when measuring the boat's height and determining if it can clear the bridge. Tides and water levels: River levels can fluctuate due to tides, rainfall, or other factors. Consider the current water level before attempting to pass under a bridge, as lower water levels may increase the clearance while higher water levels can decrease it. Navigation aids: Look for any buoys or markers that indicate safe passage or channel boundaries around the bridge. These aids can guide you through the correct path and maintain proper clearance. Traffic and speed: If there is significant boat traffic or strong currents near the bridge, adjust your speed and course accordingly. Be aware of other vessels and follow any right-of-way rules to safely navigate the area. Safety precautions: Always maintain a proper lookout and keep a safe distance from other boats. Turn on your navigation lights, use a horn or whistle to signal your approach, and communicate with nearby vessels if necessary. Remember, it is important to follow all rules and regulations set forth by local waterway authorities and the boating licensing agency in your area. Additionally, be mindful of any specific instructions provided during your boater's test regarding passing under bridges.

Can a 10 foot high boat get under the bridge at route 603 bridge boat clearence?

No, 10 feet is too high to fit under the Route 603 bridge boat clearance.

How to determine if your boat will fit under a bridge?

To determine if your boat will fit under a bridge, you need to consider the height of the bridge and the height of your boat. Here are the steps to follow: Measure the height of your boat: Measure the highest point of your boat, usually the highest part of the mast, antenna, or other structures. This measurement will give you the overall height of your boat. Research the bridge height: Find out the height clearance of the bridge you want to pass under. Bridge heights are usually marked on navigational charts or indicated by signs posted on the bridge itself. Compare the measurements: Compare the height of your boat to the clearance height of the bridge. Ensure that the height of your boat is lower than the clearance height of the bridge. It is essential to have some margin to account for factors like tides, waves, or potential errors in measurements. Account for any potential changes: Consider the impact of tides, waves, or other factors that could affect the height of your boat. For example, if the tide is high, it might increase the overall height of your boat and make it impossible to pass under the bridge safely. Seek local knowledge or expert advice: If you are unsure about the height clearance or have concerns about passing under a particular bridge, consult local marinas, boat clubs, or other experienced boaters who are familiar with the area. They can provide you with valuable information and tips about specific bridges. Remember, it is crucial to ensure sufficient clearance before attempting to pass beneath a bridge. Underestimating the height or attempting to squeeze through with little clearance can be extremely dangerous and lead to severe damage to your boat or injuries.

What is boat bridge clear with arch?

Boat bridge clear with arch is a type of bridge designed specifically for small boats. It has an arch-shaped clearance which allows boats to easily pass underneath without having to negotiate any steep incline. This type of bridge is especially useful in areas where there are large bodies of water, but the span of the bridge is too small for a full-size bridge.

How to know bridge height and which boat works?

Bridge height can be determined by contacting the local bridge authority or by measuring the distance from the water's surface to the bridge. The type of boat that works best will depend on the size of the boat, the type of water it is traversing, and the type of bridge.

How to find clearance under bridge in tides problem?

To find the clearance under a bridge in a tidal situation, you need to take into account both the water level at high and low tides. The clearance will be the difference between the highest high water mark and the lowest low water mark. In other words, the clearance under a bridge in a tidal situation is the difference between the highest flood tide level and the lowest ebb tide level.

Can boats go under the 212 bridge in milledgeville?

No, boats cannot go under the 212 bridge in Milledgeville. The bridge is too low to allow boats to pass through.

How to determine if a ship can fit under a bridge?

To determine if a ship can fit under a bridge, the clearance height of the bridge should be measured and compared to the height of the ship. Additionally, factors such as the width of the ship, the width of the bridge, and the curvature of each structure should be considered.

What is the bridge clearance for a super yacht?

The bridge clearance for a Super Yacht depends on its height, as well as the features and capabilities of the specific Super Yacht. Generally, a Super Yacht will require a minimum clearance of around 20 – 25 feet in order to pass under most bridges.

How to find out boat's height?

To determine the height of a boat, you will need to consult the specific boat manufacturer or boat model’s specifications. Each boat manufacturer or boat model will have different measurements for height. You can consult the boat manufacturer’s website, contact the manufacturer directly, or measure the boat yourself with a measuring tape from the highest point of the boat to the water line.

What boat can you buy with heigh clearance of 10 feet?

You can buy a pontoon boat with a height clearance of 10 feet.

What is term for the height of a boat?

The height of a boat is usually referred to as the draft.

How do i find the clearance under bridges?

Depending on the bridge, you can usually contact the Department of Transportation in your area to inquire about the clearance under bridges. Additionally, some states may provide online resources, such as maps or charts, that you can use to find the clearance under bridges in that state.

How to determine bridge clearance on a yacht?

Bridge clearance on a yacht can be determined by measuring the height of the top of the yacht’s mast from the waterline. This measurement will be compared to the height of the bridge from the waterline. The difference between the two measurements is the bridge clearance.

How to come up with bridge clearance for transport of boat?

In order to come up with a bridge clearance for transport of a boat, you will need to research the bridge height where you are planning to transport the boat. Additionally, you will need to consider the size and draft of the boat and any other structures or protrusions (such as a sail or mast) that may need to be taken into account when determining the bridge clearance.

How to come up with bridge clearance on boat bid calculation?

Bridge clearance is calculated by taking the overall length, width and height of the boat and subtracting it from the height clearance of the bridge. The height clearance of the bridge should be known prior to calculating the bridge clearance of the boat.

What is hor clearence boating?

Hor clearance boating is the process of sailing a boat beneath a bridge or other low overpass. It involves careful maneuvering and precise timing to ensure that the boat does not collide with the obstruction.

What kinda boat will fit under bridge clearence of 5 feet?

A boat with a draft (depth below waterline) of less than 5 feet should fit under a bridge clearence of 5 feet.

What is the maximum height of your boat if you pass brayden water at high tide?

The maximum height of your boat will depend on the type and size of your boat, as well as the local tide conditions.

How is a boays bridge clearance figured?

Boyes Bridge clearance is typically figured by calculating the difference between the bridge height and the height of the tallest object (ship, vehicle, etc.) that will be passing through the bridge. This calculation can generally be completed by adding the height of the object to the water level, and then subtracting the bridge height.

How height of the bridge to let the boat pass under?

The height of the bridge will depend upon the size of the boat. It should be high enough to allow the boat to pass under it.

How to measure bridge height of a boat?

To measure the bridge height of a boat, you will need to use a tape measure or a ruler. Start by measuring the distance from the waterline to the top of the bridge. This measurement is the bridge height. Alternatively, you can use a laser rangefinder for a more accurate measurement.

What is the bridge clearance on cobia boats?

Cobia Boats do not release specific information about the bridge clearance on their boats. It would be best to contact their customer service directly for this information.

What does gridge clearance mean on a boat?

Gridge clearance is a term used to describe the vertical distance between the highest point on the deck of a boat and the underside of the bridge or overhanging structure above. This is important in determining if a boat is able to safely pass through a bridge or other overhead obstacles.

How to calculate bridge clearance?

Bridge clearances are determined by the vertical distance between the bridge deck and either the water level or the bridge approaches. In most cases, bridge clearance is calculated by subtracting the bridge deck elevation at the highest point of the arch from the elevation of the lowest point of the arch. In other cases, bridge clearance is determined by taking the difference between the bridge deck elevation at the lowest point of the arch and the water level. In either case, the result gives an estimate of the vertical clearance available for vessels beneath the bridge.

What does bridge clearnce at mean high water mean?

Bridge clearance at mean high water is the vertical distance between the mean high water mark and the underside of the bridge. It is the minimum vertical clearance that a vessel must have in order to safely pass under a bridge at mean high water.

What is the bridge clearance for buccaneer 210 sailboat?

The bridge clearance for the Buccaneer 210 sailboat is approximately 30 feet.

What is a bridge clearance aboard a ship?

Bridge clearance aboard a ship is the vertical distance between the ship's deck and the lowest overhead object, such as a bridge or other structure that the ship may pass under.

What is the minium bridge clearence for an intrepid boat?

The minimum bridge clearance for an Intrepid Boat is 8 feet.

How to calculate boat bridge clearence on trailer?

To calculate the boat bridge clearance on a trailer, you will need to consider the following factors: Boat Height: Measure the height of your boat from the highest point, such as the top of the windshield or any antennas or structures on top of the boat. Trailer Height: Measure the height of your trailer from the ground to the highest point, usually the top of the trailer frame or the fenders. Hitch Height: Measure the height of the hitch point where the trailer connects to your vehicle. This measurement is important to ensure that the trailer is level when attached to the towing vehicle. Ground Clearance: Measure the distance between the ground and the lowest point on the boat or trailer. This is essential to ensure that the trailer does not bottom out on steep inclines or uneven surfaces. Once you have these measurements, you can calculate the boat bridge clearance by subtracting the total height of the boat and trailer (boat height + trailer height + hitch height) from the specified bridge clearance height. The bridge clearance height refers to the minimum distance between the bridge and the road surface. It is crucial to have enough clearance to avoid any damage to your boat or trailer when passing under a bridge. If the calculated clearance is less than the bridge clearance height, it is advisable to find an alternative route or choose a different trailer to transport your boat if possible.

How to.measure the height of outriggers to water line plus bridge?

To measure the height of outriggers to the water line plus bridge, you will need to follow these steps: Gather the necessary tools: You will need a measuring tape or a laser distance measurer, a level, and a pen or marker to record the measurements. Determine the starting point: Find a stable and level surface near the outriggers and water line where you can begin measuring. This could be the dock, a nearby platform, or any solid ground. Measure the distance from the starting point to the water line: Use a measuring tape or a laser distance measurer to measure the vertical distance from the starting point to the water line. Ensure that the measuring tape or laser is level and perpendicular to the water line for accurate measurement. Record the measurement: Once you've obtained the distance from the starting point to the water line, write it down or make a note of it. Measure the distance from the water line to the bridge: Move your measuring tape or laser distance measurer to the location where the bridge is situated. Again, ensure that the measurement is level and perpendicular to the bridge. Determine the height of the outriggers: Subtract the distance from the water line to the bridge (step 5 measurement) from the distance from the starting point to the water line (step 3 measurement). This will give you the height of the outriggers from the water line to the bridge. Note down the measurement: Write down or make a note of the calculated height of the outriggers. By following these steps, you should be able to accurately measure the height of the outriggers to the water line plus the bridge.

What is Pine Island bridge save clearance for boats?

The Pine Island Bridge has a vertical clearance of 25 feet at mean high water.

Is a boats bridge clearance in the water or on the trailer?

It depends on the type of boat and trailer. Boats typically have clearance in the water, since they are designed to float freely on the surface. Some boats are designed to partially submerge when being towed, while others may require a tall trailer to ensure enough clearance over the road.

How to measure Max Bridge Clearance on a boat?

The best way to measure the maximum bridge clearance on a boat is to use a measuring tape or a laser distance measurer. Start at the top of the highest point of the boat's superstructure, and measure straight up to the boat's highest point. This will give you the maximum bridge clearance of your boat.

What does maximum bridge clearance mean for boats?

Maximum bridge clearance is the maximum height of an object (usually a boat) that is allowed to pass through or under a bridge or other type of overhead structure. This is generally determined by the height of the bridge and the draft of the boat, which is the vertical distance between the waterline and the lowest part of the boat's hull. If a boat's height is greater than the bridge clearance, it must take an alternate route.

Where is a boats bridge clearance measured from?

A boat's bridge clearance is typically measured from the waterline to the highest point on the vessel.

What is bridge clearance on a boat?

Bridge clearance on a boat is the vertical distance from the waterline to the highest point of the boat, usually the top of the mast or arch. This is important to know as it can determine which waterways a boat can safely navigate.

Calculate Clearance Under Bridges & Cables

• Post author: Noel Hutchinson
• Post published: October 25, 2019
• Post category: Uncategorized
• Post comments: 0 Comments

This article will show you how to calculate clearance under bridges & cables. We often need to do this in order to see if our vessel can fit underneath. Or we may have to work our when our vessel can fit underneath as it may need the tide to fall to a certain level.

When working out this puzzle, the first thing we need to do is find the charted height of the bridge or overhead obstruction. We can either find this on the chart itself or by looking up the information in an almanac or pilot book.

Overhead clearances under bridges & cables are measured above something called HAT or Highest Astronomical Tide. This is the highest a tide can rise due to influence of celestial bodies and weather. For a reminder of the different tide levels take a look at the image below or click through to the video.

So the next step is to find the height of HAT from the tide tables. Once we have done this we know the height of the bridge and the level above which it is measured.

The thing with HAT though is that it’s not that common. HAT is the highest a tide can be expected to rise. However, the tide often falls short of that level. This means that we often have some extra space. This space comes from the difference between the height of tide (HoT) on the day and HAT.

In order to find this extra bit of space we need to use a tidal curve or an App to get the height of tide. We can then take the height of tide off of HAT. This is our extra bit of space.

HAT – HoT = extra space

You can refresh yourself on tidal curves here if you need to:

How To Use Tidal Curves – watch the video

The Final Calculation

To calculate clearance under bridges & cables then, all you need to do is add the charted height and the extra bit of space together. This will then give you the total space available for a given time on a given day.

In order to see if you will fit under the bridge take the air draft of your vessel from the total space available. If the answer is positive then you can make your way underneath safely. The air draft is the height of the vessel from the waterline to the very top.

Here’s a summary of the steps to take:

• Get the charted height from the chart or almanac
• Get the level of HAT from the tide tables
• Calculate the height of tide (HoT) using the tidal curve (or use an App)
• Take the HoT from HAT to work out the extra space
• Add the extra space to the charted height for total clearance
• Take the air draft of the vessel from the total clearance to see if the vessel can fit

Calculate Clearance Under Bridges & Cables Cheat Sheet

As always, we have produced a free cheat sheet for you to use. It will make the steps super simple and help to keep you organised as well. We find the best thing to do is laminate it. Then you can use it again and again with a dry wipe marker pen or china-graph pencil ?

Please don’t forget to like, comment and share.

Our complete set of Knowledge Cards are available from our shop

Noel Hutchinson

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How To Navigate Under Bridges

You probably already know all this, but a fast refresher never hurts. Here’s some great advice from America’s Boating Compass, formerly the U.S. Power Squadrons, about how to make your way safely under bridges, a particular issue if you’re cruising in Florida or along the Great Loop. I just want to add that you definitely need to know how to maneuver your boat in close quarters; you’ll often find yourself waiting, with several other boats, for a bridge to open, perhaps while dealing with a current, and you have to stay out of each other’s way.

• Approach bridges slowly and cautiously to make sure your wake doesn’t create problems for other boats.
• Check maps and charts for the horizontal and vertical clearances of the center channel span as many inland lakes and rivers have no minimum bridge height.
• Refer to the clearance gauge affixed to the bridge’s right side upon approach to ensure your boat will clear the bridge. The gauge marks the distance between the bridge channel span and the waterline, not the water depth under the bridge.
• Pay attention to the bridge lights when navigating at night. A green light marks the center of the navigable channel under a bridge, and red lights mark supporting piers. Use the red lights to avoid the supporting piers, which you may be unable to see until it’s too late. Watch out for strong currents, exposed rock, and trapped debris.
• Contact the bridgetender to determine a drawbridge’s clearance. Use VHF Channel 13 or 16 (Channel 9 in Florida, Georgia or South Carolina) using the low power (1 watt) setting.
• Never ask for a bridge opening if your boat will fit under a closed bridge. Lower radio antennas and movable masts when necessary.
• Know how to signal bridgetenders when you can’t reach them on VHF . Request an opening with one long (4 to 6 seconds) and one short (1 second) blast. The bridgetender will return the signal if the bridge can be opened immediately. If the bridge cannot open or is closing, the tender will sound the danger signal: five short blasts.
• Avoid getting stuck between bridges by checking cruising guides or other local knowledge sources. Not all lift bridges open on demand or on a set schedule, and railroad drawbridges can stay down for hours. Use local knowledge to avoid getting stuck between a drawbridge and a railroad bridge while waiting for the latter to open. Read more:  https://boatingcompass.org/navigating-bridges-by-boat/?mc_cid=a35b83850f&mc_eid=17593ea63d

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Water Under The Bridge

When traveling into the Seattle-area lakes eastward or expanding your horizons westward out to the Salish Sea, knowing our waterways, including the opening of bridges, is vital. Is your knowledge enough to make your transit skillful and timely? Can you slip under that bridge if the tide is low?

Decades ago, my Beneteau sailboat’s mast was scratched on the lower reaches of a bridge, a memory I’d almost forgotten. Writing this article brought back that dreadful moment. We all make a mistake occasionally, and attention to detail can go a long way towards keeping you and your family and friends safe with the boat intact. My mast survived; my pride had more damage. Other boaters have had different outcomes.

There are many bridges in Washington, with more than a dozen moveable bridges in the Puget Sound area. Our federal laws state that marine traffic has right of way over vehicular traffic. With the increase of vehicle congestion, especially around Seattle, there’s currently a compromise that places times and limits on openings during peak traffic. Size does matter and the big vessels (over 1,000 gross tons) still receive a timely opening upon request. Big or small, each boat captain must possess patience and respect, essential qualities in navigating these urban waterways. Listed below are crucial knowledge and equipment that will also help you get to where you want to go without injury or damage.

Five Easy Pieces of Knowlege:

• Understand how to be patient and respectful
• Total height of your vessel
• Clearance height of the bridge
• Factors of water level such as tides and lake levels
• How to communicate for opening the bridge

Five things to have on hand:

• Current charts or equivalent such as United States Coastal Pilot
• Current tide tables if venturing towards or from salt water
• Working horn or sound device including a spare or backup
• VHF radio capable of being tuned to channel 13
• Ample amounts of patience and respect

Let’s first plan our move for a hypothetical Super-Guppy (Guppy), a vessel equipped with a mast that lowers. The height with mast in the up-position is known to be 41’ 6” and when lowered, the height is 28’ 2”. Leaving from South Lake Washington, we wish to arrive in her new slip at Shilshole Bay Marina. The timing needs to happen October 1, per moorage agreements. Studying the charts, there appear to be many choices:

Choice #1 is what side of Mercer Island shall we travel – the shorter distance requires lowering the mast, the longer distance has plenty of clearance. Where would you find that information? Charts have vast amounts of information; essentially novels displayed graphically. You know the I-90 Bridge has boat traffic traveling under the west and east ends, but you don’t know if Guppy slips under. Reviewing the chart, at each end area you’ll find East Fixed Span… VERT CL (Vertical Clearance) 29’ and West Fixed Span… VERT CL 29’. OK, with mast down you’re good to go that direction.

Choice #2 is to travel the longer, counter-clockwise distance past Newport Shores and not have to lower mast by going under the I-90 East Channel Bridge with VERT CL 72’. Before finalizing to keep that mast up, further study the other bridges along the route. Continuing your planning northwards, the SR 520 bridge looms and again, you can find multiple ends to pass under; the East Fixed Span… VERT CL 57’ and the West Fixed Span… 44’. This shows you pass under at either place, mast up or down. After the 520 bridge, the course turns to the west and the next bridge along the path is the Montlake Bridge with a VERT CL 32’ (48’ at center).

Noting these heights, either you’re near the center or the mast must be tilted down. Since your crew today is limited and the lowering of mast process is new to them, the Guppy is leaning towards leaving the mast up and transiting towards the middle of the channel at the bridge.

Looking farther west, there’s the University Bridge and a similar VERT CL 30’ (45’ at center), therefore staying on northern side of the bridge’s center will allow the Guppy to pass under. As a good captain should understand, your fantastic crew deserves a stop at one of the several restaurants with docks in Lake Union (future article to be written).

After rewarding your crew, the lowest of the bridges is next on the northwestern end of Lake Union—the Fremont Bridge—and studying the charts, a VERT CL 14’ (31’ FOR CENTERAL 38’) is listed. Again, by lowering the mast, Guppy fits. But with mast up? No! Guess you should consider opening that bridge. Along the transit, various signs posted on the bridges structure list horn sounds and a phone number for late night transiting (see picture below).

The US Coast Guard has requested all pleasure craft to use sound signal from 0700 hours to dusk and refrain from using VHF channel 13. Additionally, read and review Opening the Bridge (under the Where to Look sidebar at bottom of page) where several links are provided, which outlines the elements of opening times and standard procedures.

Now back to our scenario. You’ve arrived just after 1430 hours thanks to your extended lunch stop. To get the attention of the bridge tender as a pleasure vessel, blow your sound device (one prolonged blast and one short blast). The bridge tender echoes back the same sound (yipee!) and the bridge shall shortly open.

If you hear four short blasts, the bridge tender has reviewed traffic congestion along with positions of nearby vessels and decided not to open the bridge at this time. Okay, remember that essential quality of patience. It’s important to allow other vessels to safely pass as you wait; the bridge tender has a stellar view of you and most of the world – remember patience! Instead, enjoy the appetizers provided by your crew and marvel at the clouds or people watch.

NOAA general information: 301-713-2816

Moveable Bridges of Washington

Seattle Bridge Opening times There’s lots of great information here – much more than just bridge openings

Unlocking the Locks , Northwest Yachting Ballard Locks Guide

Seattle Tide Station : Adjust Data to MHW and Date to October 1, 2018 then refresh Plot Daily

The relation between data of MHW, MLLW, and MHHW is referred to as “air gap.”

Lake Washington Ship Canal and Lake Washington Chart #18447.

Shortly you’ll hear the sounds, one prolonged and one short blasts, signaling the opening will soon start. Watch for the closing gates and vehicular traffic on the bridge to clear, listen to hear the locking pins release, and stand by to proceed. Five bridges done and two to go.

The Ballard Bridge is the last remaining bridge in freshwater and lists its clearance as VERT CL 29’ (46’ at center). From the previous experiences, you know the heights are good. Ahhhh – the Locks – so unique. Feel free to reference the Northwest Yachting’s Unlocking the Locks feature (March, 2017) on navigating them in greater detail.

While in the Locks, look west and spy the next bridge; Burlington Northern Railroad (or Railroad Bridge #4). Is it up or down? Will it stay up? If down, does the Guppy skate under? In simple terms, do your homework and know the tide! The charts listing is VERT CL 43’ MHW. MHW means Mean High Water. So, it’s science time, back to school; thank goodness NOAA has been on this case and provides great resources (see Bridge References sidebar).

Be prepared to side-tie along waiting walls and tight maneuvering after exiting the Locks if the bridge is down and requires an opening or lowering of your mast before proceeding west. If the bridge is down, time can be saved if one looks west under the center span area at the painted numbers with binoculars. If you’re aboard the Guppy, the reasonable minimum number you want to clearly read above the water level is 42’—which only gives 6” clearance—very tight tolerance, so check your numbers! If you’re confident with the clearances, proceed into the Salish Sea where the world awaits your venture.

Even though I know the clearance, I look it up. Rarely do I not. Remember, if you’re within inches, use patience and common sense!

Height of your vessel:

For many recreational boaters, vessel height isn’t an issue beyond local bridges. But if you’re near 29’ in height – better pay attention. It’s suggested that you know your exact height—radars and antennas included—with arches/masts up or down. A quick method used to measure is a halyard or pendant. Pull the shackle or tip to the water, marking the halyard at the exit block or known point. Before sky’ing the halyard, tie tagline to the shackle, then pull the halyard till the line end (shackle) is at its highest level, measuring the length of line you pulled and add any additional components such as the masthead and antenna heights. This total gets you the basic height.

Other vessels may find that using a level, off the top of wheelhouse or cabin top, to the water and then adding the additional vertical heights is usually sufficient for power boats. You may also look up the specifications in your manual, but that’s not reliable – a shortcut that could be costly. Keeping the vessel level during the measuring process is important for accuracy.

Where to find bridge clearance height:

The vertical clearances of bridges are sometimes painted onto the bridge’s side walls or often near the peak area of vessel traffic lane (SR 520 and I-90 bridges). These painted marks might be difficult to read at night or have seen the worst for wear. Locating information from alternate sources such as charts or Coastal Pilot, and reviewing such resources before releasing lines is highly recommended. The falling dominoes of events can eliminate precious time you were counting on for research while moving.

With your paper charts, the clearances are listed along with other information on the chart near the bridge in question. Very common today are electronic charts; these will vary in what and how information is displayed. Usually, the clearances are displayed in normal mode. Learn your system, as there are different methods to locate the information. Smartphones increasingly can be a source for your charting and are becoming a common resource. Nothing replaces a current paper chart, as batteries are not included nor needed. Often friends pull out their favorite new device and are anxious to share. It’s important to note that outside the Seattle area reception with smartphones may not be reliable.

Water levels:

Other factors that constantly change, and therefore are important to know, include water height of the lake or tide phase. Mean High Water (MHW) is the standard (tidal or lake) datum. Example: Burlington Northern Railroad Bridge, commonly referred to as “railroad bridge #4”, has a clearance listed of 43’ MHW. The S.S. Virginia V has a height of 39’10” – does she fit under? Most of the time, but not always! Water level might be higher than MHW.

A majority of sailboat masts transiting these waterways do not clear under bridges. Again, most electronic charts and many smart devices support tidal information. Learn how they work – best to do before the need arises. MHW is the average high tide observed over several years; in the United States this time period is 19 years. Tidal information on charts is commonly displayed as Mean Lower Low Water (MLLW). The tide height during your travel may be higher or lower than the MHW bridge clearance.

Using a tide station close to your bridge in question, such as Seattle station #9447130, provides more accurate data. In this case, another benefit of station #9447130 is that it also shows the true water level (red line) compared to predicted (blue line). This accounts for the many different factors such as recent rainfall, barometric pressure changes, or storm surge. The bridge clearance heights are listed in MHW and the tidal predictions are listed as MLLW.

You can toggle MLLW to MHW on the NOAA tide prediction site (linked below) which aligns the data. On October 1, the high tide listed for Seattle station #9447130 (see Bridge References sidebar) is -0.31’ at 1052 and at an earlier time of 2139, the tide is -0.80’. Meaning you have plenty of clearance for all times on October 1st.

Opening the Bridge:

This question is: Do I slip under with room to spare or spend a lot of money fixing the mistake? If you fit under, proceed. If you need a bridge opening, use the horn and blow one prolonged blast (duration of 4-6 seconds) with a 1-second gap followed by one short blast (duration of 1 second). If the bridge operator does not wish to open the bridge, they usually sound four short blasts. Usual suspects for not opening the bridge is the traffic congestion or timing since the last opening, also consider how loud your sound device is.

CFR 33, 117.15 (b) Sound signals. (1) Sound signals shall be made by whistle, horn, megaphone, hailer, or other device capable of producing the described signals loud enough to be heard by the drawtender.

When the bridge operator can open the bridge, they will sound the same sounds—one long and one short blast—and you should be able to see the traffic guards rotate down and the span open.

While approaching and during this time, be aware of other vessels. Allow vessels who can navigate the bridge without opening to proceed. Some vessels have special requirements. Within this article there’s not enough space to outline all of them, but here are a few important highlights: Vessels constrained by draft or height and vessels restricted in their ability to maneuver have the right of way over other vessel in narrow channels and near/around the bridges discussed here. When these vessels near a blind bend (such as the approach to the University Bridge) the vessel shall sound a blind bend sound signal, which is four 6-second long blasts.

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Imagine being on a boat, looking up at the orange splendor of this fabled bridge, turning left, and not looking back, feeling the pull of the swirling currents taking you where they want, not where you want — the funneled blast of frigid Pacific wind numbing your ears.

Now imagine sailing your boat under this bridge. Yes, your very own, bought-it-yourself-with-hard-earned-money sailboat. Scary, right? These feelings are hard to describe, but I’ll try.

I feel I’m in way over my head as my lovely, smiling bride glances at me for reassurance. Have we made the right decision?

I flash a smile of confidence. Yet inside, I’m twisted in a knot. Hearing the rumbling of cars overhead, I glance up. A tingling wave of accomplishment unties the twisted knot and sends peaceful goosebumps across my neck and down my arms. Tears of satisfaction fill my eyes then race down my cheeks to be cast into the sea by the gusting wind.

I feel alive. The world lies at my feet, open, waiting for me to take the next step, the next breath. I feel free. Free to go faster, or slower, or turn the boat in lazy circles if I want.

I feel humble. How can I be so fortunate? How can I share this moment with my family and friends? These feelings fill me to the brim. If I speak, I’ll turn into a puddle on the deck, so I don’t say anything for fear of ruining the moment. I feel joy, and smile the biggest shit-eating grin. The world has just shown me one of its secrets.

14 Comments

Wonderful! Bon voyage wherever you go…

One of my biggest thrills was being at the helm of “Rage” then owned by Steve and Nancy Rander, as we sailed her under the Golden Gate Bridge after a delivery from Victoria, B.C. We passed under that legendary span, the city spread out before us, bathed in sunshine, and when I finally surrendered the helm, someone handed me a cold Anchor Steam. Perfect.

When we sailed out the Gate on our way to Mexico, I did not have any emotion. However, after sailing back from Ztown and 7 months later, sailing under the GGB was very emotional! I now understand what sailors feel when sailing under this iconic landmark! Especially after such a successful and amazing voyage under our belt. Read about our adventures:

http://h2uh0.blogspot.com/2020/05/15-years-of-h2uho.html?m=0

Bon voyage, fair winds and following seas!

This captures that magic moment so well! Have a lump in my throat as I finished reading it. Thanks

I share the dream. Sail onward and fairwinds!

Very nicely expressed. Great choice of vessel. Spacious solid. I understand in a limited way their feelings having participated in several offshore races, and deliveries. Time slows down perceptively and suddenly you have left the day to day worries behind. As my cruising friends all say, you leave one life style and accept the pleasures and challenges of new ones.

Great sailing name. It’s what you do after rounding the wx mark…. Chuck Cunningham!

My fiance turned into an a real jerk after he did this while delivering a sailboat to Hawaii with friends. We broke up shortly thereafter. Completely went to his head and his ego thereafter was insufferable. You’d think he had discovered America … or something.

Congratulations! Fair Winds!

As someone who has done it a few times, you have nothing but joy ahead of you.

Of course, you’ll be challenged, the sea challenges us all. But, in the end, the Pacific deserves her name. She is a kindly mistress and you’ll do fine. Have a great time and don’t come back until you are truly done.

We were lucky also – we left the gate and turned left November 2018, had so much fun along the way that we stopped in every harbor – only missed one and spent a year in California before making it to Mexico this spring – word Of advise – take your time , I know we’ll never sail those waters again – destination New Zealand in a few years !!

Will there be more chapters in this adventure?

As my good friend, Capt Mike Priest always mentions, “it never gets old going under the Golden Gate Bridge.” It’s such an iconic structure. Mike has thousands and thousands of ocean miles under his belt, but passing under the GG Bridge is at the top of his list.

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Historic covered bridges, like in Long Grove, are under threat by truck drivers relying on GPS

LYNDON, Vt. -- One of Vermont's historic covered bridges has fallen under threat from modern technology.

Box truck drivers relying on GPS continually crash through Lyndon's 140-year-old Miller's Run bridge despite signs, including a flashing one, to deter vehicles that are too tall or too heavy from crossing.

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Drivers can face a fine of $5,000 from the town, plus state penalties.

Still, the bridge keeps getting whacked.

"GPS is the most general excuse that is given by drivers that do hit the bridge," said Justin Smith, Lyndon's municipal administrator.

He says the real problem is lack of common sense.

The bridge, built in 1878 and renovated in 1995, lies on a short cut motorists use to avoid downtown Lyndonville.

The community, which has five historic covered bridges, including two that are in use, calls itself the "Covered Bridge Capital of the NEK," short for Northeast Kingdom area.

Police chief Jack Harris estimates the Miller's Run bridge has been struck two dozen times.

On at least one occasion it was hit two times in one day.

Harris said the issue is that drivers are using GPS programs for cars rather than commercial vehicles.

Typically, the damage is cosmetic, though on two occasions the bridge had to be closed for several months for repairs, he said.

In 2019 a delivery truck hit the supports and the engineering and repair costs were nearly $100,000, said Smith.

About half the time, the town recoups insurance money from the drivers- if it catches them. Many just drive away.

"They will claim that they didn't know they hit it and yet you'll see the truck stop in the middle of the bridge and they'll look up to see that they're hitting the bridge," Police Chief Harris said. "I can count the number that have stopped and waited on one hand."

Many are inexperienced in driving box trucks, such as people who may have just rented one to move.

"Every now and then we'll get a large camper being pulled through and those generally get damaged because the bridge will take air conditioning units right off the top," he said.

A neighbor's security camera trained on the bridge has helped track down some errant drivers.

According to Bill Caswell, president of the National Society for the Preservation of Covered Bridges, Lyndon is far from alone.

"You can visit many covered bridges throughout Vermont and other states and see broken boards on the portals and broken or missing roof braces," he said by email.

Last November, a tractor trailer truck seriously damaged a covered bridge in Princeton, Illinois, and a bridge in Ohio was damaged in a similar way a year earlier, he said.

RELATED: Historic Long Grove bridge hit again for a total of 50 incidents since it reopened

A historic covered bridge in Cobb County, Georgia was struck numerous times until metal barriers were installed at each end. It also has a warning signs and flashing lights.

"Even with all the warnings, the barriers are still struck," Caswell wrote. "But the bridge is now protected."

A box truck rental company in Lyndonville now warns drivers about covered bridges in the area.

The town is considering installing a steel beam in front of the bridge to force trucks that are too tall to a full stop.

A Google spokesperson said, "Google Maps is designed for drivers of standard-sized vehicles. To get the best routes, we encourage drivers of trucks and larger vehicles to use navigation tools designed specifically for those vehicle types."

Apple did not respond to an email seeking comment.

Smith said there are mixed views in town about what to do.

"Some people obviously want to see something that protects the bridge so we can keep it in place," he said. "Others are like: 'It's time to take it off and set it on the side and put a more standard bridge in."

"I swear, we could take that bridge out and not replace it and people would go in the river. It's very frustrating to think that we are that set to what something tells us to do." Smith said.

A covered bridge in Long Grove has been closed for repairs multiple times because of drivers ignoring height warnings.

Despite warning flags stating "No trucks or buses" every few feet, the bridge kept being hit.

ABC7 Chicago reported that as of June 2023 the bridge had seen its 50th recorded crash.

A U-Haul driver involved in one of the crashes told police he didn't see the warning signs because he was following his GPS.

READ MORE: Why do people keep hitting the Long Grove covered bridge?

The bridge has been equipped with steel reinforcements since 2020, meaning the vehicles that crash into the bridge now take most of the damage.

ABC7 Chicago contributed to this report.

Note: The featured video is from a previous report.

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‘Below Deck’ Sails Into a New Era

With a different captain at the helm and new production elements, the reality show about charter yachts is switching up its style.

By Shivani Gonzalez

Starting a new season of “ Below Deck ” can be similar to returning to summer camp as a kid — you know it’s going to be fun and that you’ll be in the same environment, but some of the people will be different and you’re not quite sure what the vibes will be.

This time around, in particular, feels that way because for the first time in the show’s 11-season run, Captain Lee Rosbach is no longer at the helm. It’s a pivotal moment for a franchise that has become one of the most popular entities in the sprawling universe of reality TV since premiering on Bravo in 2013 . The show’s appeal was built on endless romances between various crew members (“boatmances,” as they came to be known), horrible charter guests and some sort of passive-aggressive fight about how many shackles of the anchor chain should be in the water. And there was always Rosbach presiding over the drama as he trudged around the boat, reeling off one liners like “I’m madder than a pissed-on chicken” and “we screwed the pooch so many times we should have a litter of puppies running around.”

At the center of the show now is Kerry Titheradge (the stern yet goofy captain of “Below Deck Adventure” fame), who is managing the Motor Yacht Saint David with the cheeky chief stew Fraser Olender by his side.

With that change in captain, the energy on the boat — both onscreen and off — is different, according to Olender.

“Lee has a no B.S. attitude, which I love with him,” Olender said in an interview. “With Kerry, he taught me a lot and sort of forced to me confront issues directly with my team, work them out, as opposed to making executive decisions too soon.”

This shift in management style changes the central conflict — whereas the drama once focused on the captain swiftly kicking out any unpleasant crew member (as we might have seen with Rosbach), the drama now focuses on the whole crew trying to get along (since Titheradge gives people those second chances).

Additionally, Olender noted that the captain’s relationship with the crew can also affect the drama on board.

“Captains absolutely do get involved, whether they know it or not,” Olender said, adding that for the crew, everything is about “trying to impress your captain.”

This phenomenon plays out early in the new season when the lead deckhand, Ben Willoughby, called out a fellow crew member over the radios about not wearing a life vest — something he easily could have done in private. The drama that followed became an interpersonal conflict between the two of them, both with the ultimate goal of impressing Titheradge. (Of course, the two deckhands had kissed on the previous crew night out, which is more in line with the “Below Deck” drama viewers are used to.)

For “Below Deck” showrunners, the changeovers in the cast allowed them to rethink what the show would look like.

From the season premiere, it was immediately apparent that Rosbach’s absence wasn’t the only change this season: The filming is sleeker, the daily, multicourse meals prepared by the chef are given their own glamour shots and the cameras sometimes cut to the perspectives of yachties running around on deck and through the galley.

“Our showrunner, Lauren Simms, is an avid consumer of all different kinds of media,” Noah Samton, a senior vice president of unscripted current production for NBCUniversal, said in an interview. “She pitches us different ideas on how to stylistically evoke different feelings and change the mood a little bit of ‘Below Deck’ without removing what really works.”

Moving through the rest of the season, and potentially through seasons to come, Olender is aiming to bring a cutthroat management style while also bringing affection for his stews, all with his signature British humor.

On Bravo’s side, there are changes in the works for the other “Below Deck” spinoffs — including “Sailing Yacht,” “Mediterranean” and “Down Under” — which collectively, have 26 seasons. Specifically, Samton said that “Down Under” is currently filming and that even though fans should be ready to see new things, the show will stay true to its original concept.

“These are real yachties doing a real job so you have to stay within those confines because the audience isn’t going to want anything that is too produced or fake,” Samton said. “So we have to find ways to reinvent while staying true to the original concept of the show.”

And as Olender said: “I’m sure that every year if I were to work with this franchise again, that I’ll be thrown a collection of total chaotic and disastrous stews — that’s what makes it watchable.”

An earlier version of this article misquoted Fraser Olender, the chief stew of “Below Deck.” He said, “I also feel like Kerry this season. ... Lee has a no B.S. attitude, which I love with him,” not “I feel like Kerry this season, as opposed to Lee, has a no B.S. attitude, which I love with him.”

How we handle corrections

Shivani Gonzalez is a news assistant at The Times who writes a weekly TV column and contributes to a variety of sections. More about Shivani Gonzalez

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Seven Mile Bridge Marathon

• Thread starter Larry Pierce
• Start date Jun 13, 2022
• Forums for All Owners
• Ask All Sailors

Larry Pierce

I have heard conflicting answers to the following question. Can I get my 2006 Hunter 45cc, with in mast furling, under the 65' Seven mile bridge? Any 45cc owners out there who have made the trip? Some wind instruments on top, but nothing elaborate.  

SEMPERAVANTI41

Don't know about 45cc, but I know my boat cannot get under. Do you know about Snake Creek Drawbridge?  

The tide board seemed accurate when I went through. Not a H45CC, but my mast is 62’8” plus windex and VHF antenna and I wasn’t close to touching with 66’ on the board.  

Attachments

It all depends on how tall your mast is, over 65 no go. There is a draw bridge between Key Largo and Marathon.  

Thanks to all. I will look into the drawbridgr.  

You must go up mast measure to be sure for sure  

seadaddler said: You must go up mast measure to be sure for sure Click to expand

What is your Draft, 5' or 6' 6"? From the specs the shallow draft boat has a mast height of 57' 4" while the deep draft has a mast height of 61' 4". If your boat has the 6' 6" draft it has no business being in the Keys. For insurance you may approach at low tide , check the bridge markers and watch for any traffic that may kick up some swells. Use the center of the channel at slow speed.  

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Lily Gladstone Searches For a Missing Girl in New 'Under the Bridge' Trailer

Lily Gladstone and Riley Keough star in the missing persons mystery drama.

The Big Picture

• Lily Gladstone stars in the new Hulu show, Under the Bridge , as an investigator in a missing person's case.
• The show follows true events surrounding the disappearance of Reena Virk.
• The series premieres on April 17, 2024, on Hulu.

Academy Award nominee Lily Gladstone ( Killers of the Flower Moon ) is back for more mysteries in a new show for Hulu titled Under the Bridge . A new trailer has Gladstone playing an investigator embroiled in a tough missing person's case. Based on Rebbecca Godfrey 's 1997 book of the same name, Under the Bridge tells a story based on true events about fourteen-year-old Reena Virk who went with friends to a party and never returned home. Through Godfrey's ( Riley Keough ) and Bentland's (Gladstone) eyes, the audience goes into the hidden world of teen girls and a boy accused of Virk's murder.

The trailer sets up the main mystery, as a narrator teases that "there's danger everywhere. But danger had never looked quite like this before," as faces of young teenage girls flash across the screen. Gladstone's Bentland introduces the story's conflict as she tells another person about a girl who has been missing for three days. Keough's Godfrey comes in to help with the case and hopes that her being an outsider might help people open up. She begins her investigation by interviewing several suspects, but what she learns at every turn proves shocking and confusing. She uncovers a world of secrets as she pursues her targets. The trailer concludes with a final mystery as Bentland plays a video and mutters "Can't be" in disbelief at what unfolds before her.

Who Is Behind 'Under The Bridge'?

The late Rebecca Godfrey is credited as an executive producer. The series stars Gladstone as Cam Bentland , a police investigator who wrestles with her position as a woman of color in a male-dominated field. She also struggles with her queer identity and, throughout the series, will battle her beliefs about the justice system and how reality differs from what she expects it to be. Keough stars as Rebecca Godfrey, from whose perspective the story is told. Series regulars include Izzy G , Chloe Guidry , Ezra Faroque Khan , Archie Panjabi , Vritika Gupta , Javon “Wanna” Walton , and Aiyana Goodfellow .

The series was adapted for the screen by Quinn Shephard and is executive produced by Samir Mehta , Liz Tigelaar , Stacey Silverman , Shephard, Godfrey, and Tara Duncan . Keough will executive produce with Gina Gammell . Geeta Patel will direct the pilot and EP the episode. The series is produced by ABC Signature.

The 8-episode season premieres on April 17, 2024, on Hulu with two episodes. Watch the trailer below:

Watch on Hulu