Florida Bridge Clearance Guide for Boaters: Know Before You Buy a Dock Home

You found the perfect waterfront home. Deep-water dock, no HOA, priced right. You make an offer, close, and then try to take your 42-foot sportfish out for the first time — only to discover a 24-foot fixed bridge sitting between your new dock and the open ocean. The boat stays home. You never move it again. You eventually sell the house at a loss.

This scenario plays out every year in Florida. Bridge clearance is the single most important — and most overlooked — factor when buying a waterfront dock home. This guide will make sure it never catches you off guard.

What Bridge Clearance Actually Means

Bridge clearance is the vertical distance between the water surface and the lowest point of a bridge structure. In the United States, clearances are officially measured and published at Mean High Water (MHW) — the average height of the highest tide over a 19-year cycle. This is the most conservative measurement, meaning the water will often be lower than MHW, giving you more clearance. But during king tides and storm surges, it can be tighter.

Your boat's air draft is what matters on your end: the height from the waterline to the tallest fixed point on the vessel. For most center consoles and bay boats this is the VHF antenna or hardtop frame. For sportfish and motoryachts, it is usually the outriggers or flybridge hardtop. Trawlers and sailboats have their own constraints. Always know your air draft before researching any waterway.

The rule is simple: bridge clearance at MHW must exceed your air draft, ideally with at least 6 to 12 inches of margin. If it does not, that waterway is off limits for your vessel.

Fixed Bridges vs. Bascule (Drawbridges)

Florida has two main bridge types that matter to boaters:

Fixed Bridges

Fixed bridges do not move. Their clearance is what it is, 24 hours a day, 7 days a week. If your boat is taller than the bridge, you cannot pass. Full stop. Fixed bridges are the primary concern when evaluating a waterfront home purchase because there is no workaround. The Florida Department of Transportation (FDOT) publishes fixed clearances for all state-maintained bridges. These are the bridges that define what boats can actually live on a given canal or waterway.

Bascule Bridges (Drawbridges)

Bascule bridges open on a schedule or on signal. Florida law requires most bascule bridges on the Intracoastal Waterway to open on demand (or on a fixed schedule during restricted hours). When closed, they typically have 14 to 25 feet of vertical clearance. When fully open, they provide unlimited clearance for essentially all recreational vessels. The tradeoff is time — you may wait 15 to 30 minutes for an opening during peak hours. Restricted opening schedules during rush hours on busy bridges like the 17th Street Causeway in Fort Lauderdale can add significant time to your trip. For daily commuters by boat, this matters. But at least you can get through.

When evaluating a property, fixed bridges are the hard limit. Bascule bridges are an inconvenience, not a barrier.

How Tidal Range Changes the Equation

Florida has a relatively modest tidal range compared to the Northeast — typically 1.5 to 3.5 feet depending on location — but it still matters. Because clearances are measured at MHW, you gain clearance at low tide. On the Gulf Coast around Tampa Bay, the tidal range can be 2 to 3 feet, meaning a bridge that shows 12 feet at MHW might offer 14 or 15 feet at mean low water. This is not a reason to push your luck, but it explains why some experienced boaters know they can sneak under a bridge at low tide that they could never pass at high water.

Florida also experiences king tides every fall (typically October and November), when astronomical high tides push water 1 to 2 feet above predicted levels. During king tides, even bridges you normally clear comfortably can become tight. Always check the tide chart before transiting any low-clearance bridge.

Major Fixed Bridge Bottlenecks by Area

Here are the key fixed bridge clearances that define waterway access across South and Central Florida. These are the bridges that make or break a waterfront property for tall-masted sailboats, sportfish vessels, and motoryachts:

What this means in practice: If you own a sportfish with 16-foot outriggers, a home in the Fort Lauderdale New River area may effectively strand your boat in the ICW. Las Olas at 24 feet lets you through, but once you are deeper into the river network, many fixed bridges drop to 14 to 17 feet. A home in Miami Beach north of the Julia Tuttle Causeway gives you 56 feet of clearance to the ocean — workable for nearly any recreational vessel. But a home in one of the many finger canals off Biscayne Bay that sits behind the Venetian Causeway at 14 feet is a different story entirely.

How to Check Bridge Clearance for Any Route

Before you make an offer on any waterfront property, map the full route from that dock to open water and identify every fixed bridge along the way. Here is how to do it:

• NOAA Charts: The NOAA Office of Coast Survey publishes nautical charts that show bridge clearances. Use the NOAA Chart Viewer at charts.noaa.gov to pull up chart coverage for any Florida waterway.
• USCG Bridge Information: The U.S. Coast Guard maintains the National Bridge Inspection database. The USCG District 7 (which covers Florida) publishes bridge restriction notices and clearance data.
• Active Captain: This cruiser-contributed database (now part of Garmin) contains real-world bridge clearance reports, including community notes about actual vs. published clearances.
• Waterway Guide: Published annually, the Waterway Guide for the Southern states includes detailed bridge tables for the ICW and all major Florida waterways.
• Google Earth: Not authoritative, but useful for visualizing the waterway from a property to open water and identifying bridge crossings you need to research.

The most reliable method is to physically run the route — either yourself or with a local captain — before closing. No database is perfectly current. Bridges get repaired, clearances get recalculated after resurfacing, and local knowledge about tidal windows is invaluable.

Why Your Mast Height Is Not the Only Number That Matters

Sailboat owners know to check the mast height, but powerboaters sometimes underestimate their air draft because they are thinking of the hull and forgetting about:

• Extended outriggers (can add 4 to 8 feet in locked position)
• Radar arches and hardtop extensions
• VHF and GPS antennas mounted at the top of a tower
• Fly bridge canvas or bimini frames
• Tuna towers (can push air draft to 25 feet or more on a 40-foot sportfish)

Many experienced boaters add 12 to 18 inches to their measured air draft as a safety margin. If a bridge is listed at 24 feet and your vessel with outriggers deployed is 23 feet, that is not a safe transit.

How DockOnly Filters by Bridge Clearance

This is precisely why DockOnly's property search includes bridge clearance filters. When you search for waterfront dock homes on DockOnly, you can specify your boat's air draft and filter to only show properties where the navigable route to open water clears your vessel. We map the fixed bridge network for each listed property and calculate the maximum air draft that can transit from that dock to the nearest inlet or open bay.

Every listing also includes a Dock Score that factors in bridge clearance as a primary metric. A property with a deep-water dock but a 14-foot fixed bridge blocking ocean access scores very differently from one with unobstructed ICW access to an ocean inlet.

The days of discovering bridge problems after closing are over. When you search on DockOnly, the bridge clearance data is right in the listing — before you schedule a showing, before you make an offer, before you commit.

The Bottom Line

Florida has over 1,300 miles of coastline and thousands of navigable waterways, but they are not all created equal for boaters. The difference between a waterfront home that works for your boat and one that does not often comes down to a single fixed bridge with a published clearance that nobody checked. Do not skip this step. Know your air draft, map your route, and use tools built for boaters — not general real estate platforms — to find your next waterfront home.

Ready to search for properties filtered by your boat's clearance requirements? Start your DockOnly search here.