The Atlantic Intracoastal Waterway (AICW / ICW) or "The Ditch," as many refer to it, provides the mariner with a continuous, and for the most part, protected passage just inside the Atlantic Seaboard from Norfolk, VA down into the Florida Keys.
The AICW is made up of both natural and man-made; rivers, bays, sounds and canals. While it is primarily used by pleasure craft, many commercial light-draft vessels as well as smaller tugs and tows also make use of the Atlantic Intracoastal Waterway in an effort to avoid long open ocean passages.
While many consider Manasquan, NJ to be the northern end of the AICW, with the New Jersey Intracoastal Waterway beginning here, it is not!
The NJICW does allow for smaller boats to cruise south through New Jersey’s largely unimproved channels, but caution is warranted. Much of New Jersey’s ICW is shoal with a number of fixed bridges having a limiting vertical clearance of 35 feet. Most, if not all, boats (power or sail) bound for warmer climes elect to sail coastwise rather than attempt the New Jersey ICW.
For the mariner bound south from New York and New England, once at Cape May, NJ, a choice of (2) routes are available. The inside route which will take you through the Delaware Bay, the C&D Canal, and the Chesapeake Bay or you can elect to sail coastwise to the Chesapeake Bay Entrance. Both routes leading to Norfolk, VA and (MM "0.0"); the official start of the Atlantic Intracoastal Waterway.
Beginning at mile marker (MM "0.0") located at (36°50’54” N / 76°17’54” W) in Norfolk, VA, the Atlantic Intracoastal Waterway stretches 1,153.4 SM (1002.1 NM) south to its end near Plantation Key, FL.
In the Virginia section of the AICW, (2) routes are available once again to the mariner. Beginning near (MM "7.1") where they split, Route #1, the most common route used and providing deeper water, follows the Albemarle and Chesapeake Canal to Albemarle Sound and Route #2, the alternate route, is through Great Dismal Swamp Canal to Albemarle Sound. Both Route #1 and Route #2 rejoin in the vicinity of (MM "79.0") in North Carolina.
Intracoastal Waterway Aids to Navigation (ATONS) are like most other lateral marks in U.S. waters. The channel delineation markers are red or green. In order to distinguish them from other lateral marks, the ICW marks will also show either a yellow square or yellow triangle.
As a general rule, like the standard lateral buoyage system, the direction of travel is paramount in knowing which color marker to keep on which side. Unlike the lateral system the direction of travel is not "Red Right Returning." Since the direction of travel on the ICW is north/south or east/west, means that the very basic rule of thumb is "Red Markers" are kept to starboard when south or west bound and "Green" marks are kept to port. This obviously reverses if you are travelling north or east bound.
When using the very basic rule of thumb above, you need to understand that it will prove true 98% of the time. The problem is the other 2% that will see you heading in the wrong direction, running hard aground, damaging your running gear, or worse.
Remember the little Yellow Squares and Triangles that we mentioned earlier? Well they are what you need to concentrate on and what you should be following.
The Rule Is: When proceeding southbound on the Atlantic Intracoastal Waterway (Norfolk, VA to the vicinity of Plantation Key, FL) or northbound/westbound on the Gulf Intracoastal Waterway (Ft. Meyers, FL to Brownsville, TX).
Regardless of the color of the mark!
This becomes critically important when the ICW temporarily merges with or crosses a second navigable channel.
Lights and daybeacons should not be passed close aboard because those marking dredged channels are usually placed back from the bottom edge of the channel and others may have rip-rap mounds around them to protect the structures.
The following (14) NOAA charts cover the entire length of the AICW from Norfolk, VA (MM "0.0") to Key West, FL.
All distances along the Atlantic Intracoastal Waterway are given in statute miles unless otherwise noted. Statute miles are used in order to conform to the distances shown on the small craft charts typically used along this route.
The Federal Project Depth for the AICW via Albemarle and Chesapeake Canal (Route #1) provides for a least depth of 12 feet from Norfolk, VA, (MM "0.0") to Fort Pierce, FL, (MM "965.6"). From Fort Pierce south to Miami, FL, (MM "1089.0") the Federal Project Depth is 10 feet. From Miami south and west to Cross Bank (MM "1153.4") the Project depth is 7 feet.
DO NOT confuse "Federal Project Depth" with "Controlling Depth" or for that matter with the actual depth of the water that is available at the time you transit any given area.
Keep in mind that the Atlantic Intracoastal Waterway south of Miami has only been completed as far as Cross Bank (MM "1153.4"); the remainder has been put on hold. While no work has been performed south of Cross Bank, a channel, marked with standard ICW markings, leads from Cross Bank to Big Pine Key along the northwesterly side of the Florida Keys. In the vicinity of Bethel Bank, at Moser Channel, the route splits; going either north through Florida Bay and up the west coast of Florida or south to Hawk Channel and then on to Key West.
At last count (01//01/2021), a total of 135 bridges cross the Atlantic Intracoastal Waterway between (MM "0.0") in Norfolk, VA and (MM "1089.0") in Miami, FL. Not surprisingly, operating bridges are slowly becoming fewer and fewer. The trend is an increasing number of fixed bridges and a decreasing number of operating bridges.
The minimum overhead clearance of fixed bridges over the AICW is 56 feet at the Julia Tuttle Bridge in Miami, (MM "1087.1"). This means vessels requiring more than 56 feet bound for Miami must leave the Atlantic Intracoastal Waterway at Fort Lauderdale (Port Everglades) (MM "1066.5") and sailing coastwise, re-enter at Miami (Government Cut) at (MM "1089.0").
All operating bridges on the AICW guard either channel 09 or 13 as their working channels depending on the state they are located in.
It should be noted that in recent years there has been ongoing bridge construction the length of the ICW in an effort to replace many of the existing operating bridges. As these new high level (65+ feet) bridges have been completed many of the operating bridges they have replaced are being demolished and of those that remain, many are having their operating schedule restrictions modified or lifted completely.
The minimum authorized clearance of overhead cables crossing the AICW is 68 feet at Snows Cut, (MM "295.8"), in Federal Point, NC.
Caution - Many of the overhead cables over the waterway carry high voltage, and an extra margin of safety should be allowed when the weather is threatening.
There are a total of (3) locks on the Atlantic Intracoastal Waterway, with (2) being located in Virginia and (1) in North Carolina.
Great Bridge Lock in Virginia (MM "11.5") is the only lock on the Intracoastal Waterway between Norfolk and Key West using the Albemarle and Chesapeake Canal (Route #1.) It is 600 feet long (530 feet usable), 75 feet wide (72 feet usable), 16 feet over the sills, with a lift of 2.7 feet.
For those using the Great Dismal Swamp (Route #2), you will encounter (2) locks one at Deep Creek, VA (MM "10.6") and the other at South Mills, North Carolina (MM "33.0"). Both Locks are 300 feet long, 52 feet wide, 12 feet over the sills, and a lift of 12 feet.
The tides along the Atlantic Intracoastal Waterway are semi-diurnal. South of Plantation Key, FL the tides become Mixed-Semi-Diurnal.
Under normal conditions the mean range of tide in the AICW is from non-tidal just south of Great Bridge Lock increasing to about 7 feet throughout most of Georgia. Continuing south, the tidal range decreases to about 1.3 feet at Key West.
In many sections, the height of the tide is heavily influenced by the force and direction of the winds.
The following pages list the bridges & locks; their schedules, and restrictions along the Atlantic Intracoastal Waterway (AICW) from Norfolk, VA to Miami, FL.
In addition to each state's bridge list, the complete AICW (Norfolk to Miami) bridge operating schedule can be downloaded for your personal and private use. The ZIP file contains the schedule in Adobe (.pdf) file format.
These lists are believed to be accurate as of July 2021. If any errors or omissions are noted, please e-mail us at with any corrections or recommendations.