Cruising/Navigating the GIWW in Texas

Port Arthur, TX to Brownsville, TX

The Texas portion of the Gulf Intracoastal Waterway (GIWW/GICW) has its start at 30°03.2’ N / 93°43.2’ W (MM 266.0 WHL) on the Sabine River which divides Texas from Louisiana.

From the Sabine River, the Texas GIWW runs for 415.5 miles starting out in a generally southwesterly direction before gradually turning to the south near Aransas, TX before ending in Brownsville, TX at 25°57.1’ N / 97°24.1’ W (MM "681.5 WHL") very near the Texas / Mexico border.



The Texas Gulf Intracoastal Waterway is marked with your standard Aids to Navigation which also display yellow triangles or yellow squares. When southwest and south bound along the Texas GICW, marks displaying yellow triangles should be kept on your starboard hand and those marked with yellow squares should be kept to port.

While typically the yellow triangles will be found on red markers and yellow squares are found on green markers, caution should be exercised along this route in the vicinity of the Sabine River, Galveston Bay, Chocolate Bay, Port O’Conner, Victoria Barge Canal, and Port Isabel where the GIWW intersects or coincides with the channels marked by the Lateral Buoyage System.


NOAA chart coverage of the Texas portion of the GIWW beginning at (MM “266.0 WHL”) to (MM “681.5 WHL” is provided by charts #11331, #11324, #11322, #11319, #11315, 11314, 11308, 11306, 11303, and #11302. These charts can be viewed by clicking on the links below:

Chart #11331 covers the GIWW from Ellender, LA at (MM "243.6 WHL") to Galveston Bay at (MM "350.2 WHL").

Chart #11324 covers the GIWW from Galveston Bay Entrance at (MM "350.2 WHL") to West Bay at (MM "359.9 WHL").

Chart ##11322 covers the GIWW from Galveston Bay at (MM "359.9 WHL") to Cedar Lakes at (MM "409.2 WHL").

Chart ##11319 covers the GIWW from Cedar Lakes at (MM "409.2 WHL") to Espiritu Santo Bay at (MM "479.5 WHL").

Chart #11315 covers the GIWW from Espiritu Santo Bay at (MM "479.5 WHL") to Carlos Bay at (MM "510.5 WHL").

Chart #11314 covers the GIWW from Carlos Bay at (MM "510.5 WHL") to Redfish Bay at (MM "535.5 WHL").

Chart 11308 covers the GIWW from Redfish Bay at (MM "535.5 WHL") to Laguna Madre at (MM "587.3 WHL").

Chart 11306 covers covers the GIWW from Laguna Madre at (MM "535.5 WHL") to Chubby Island at (MM "635.1 WHL").

Chart 11303 covers the GIWW from Chubby Island at (MM "635.1 WHL") to Stover Point at (MM "656.9 WHL").

Chart 11302 covers the GIWW from Stover Point at (MM "656.9 WHL") to Port of Brownsville at (MM "681.5 WHL").

Chart #11331 - Ellender to Galveston Bay
Chart #11324 - Galveston Bay Entrance
Chart #11322 - Galveston Bay to Cedar Lakes
Chart #11319 - Cedar Lakes to Espiritu Santo Bay
Chart #11315 - Espiritu Santo Bay to Carlos Bay
Chart #11314 - Carlos Bay to Redfish Bay
Chart #11308 - Redfish Bay to Laguna Madre
Chart #11306 - Laguna Madre to Chubby Island
Chart #11303 - Chubby Island to Stover Point
Chart #11302 - Stover Point to Brownsville

Distances and Mileages

All distances along the Texas Gulf 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.

This portion of the GIWW between the Louisiana State line and the Mexican border is measured based on increasing mileage West of Harvey Lock from (MM “266.0 WHL”) to (MM "681.5 WHL").


The Federal project depth for the Texas portion of the Gulf Intracoastal Waterway provides for a minimum channel depth of 12 feet. Even though every effort is made to maintain the project depth, the actual controlling depths in the channels may vary due to shoaling reducing the available water depth until maintenance dredging can be accomplished.


Found along the shores of the Texas Intracoastal Waterway

Bridges, Locks, & Overhead Power Lines


A total of 13 bridges cross the Gulf Intracoastal Waterway in the state of Texas. The fixed bridges (10), all have vertical clearances of 73’ or better with the exception of the "State Road 361 Bridge" in Aransas Pass, TX having a clearance of only 48’. An alternate channel does exist that allows this bridge to be bypassed if necessary.

The (3) operating bridges all have closed vertical clearances between 0’ and 8’ that will prohibit most vessels from passing through without an opening. All guard VHF Channel 13.

Open Down Arrow GIWW - Texas Bridge Schedule
Port Arthur to Freeport

Gulf Intracoastal Waterway Bridges - Texas (GIWW)

Port Arthur to Freeport

Mile Marker Bridge Charted Vert. Clear. Schedule Restrictions VHF
287.7 WHL Gulf Gate Bridge 136’ Fixed Bridge    
289.0 WHL West Port Arthur Bridge 73’ Fixed Bridge    
319.3 WHL High Island Bridge 73’ Fixed Bridge    
357.5 WHL Galveston Causeway RR Lift Bridge 8’ / 73’ Opens on Demand   13
357.6 WHL Gulf Freeway Bridge 73’ Fixed Bridge    
393.8 WHL Surfside Beach Bridge 73’ Fixed Bridge    

Open Down Arrow GIWW - Texas Bridge Schedule
Freeport to Brownsville

Gulf Intracoastal Waterway Bridges - Texas (GIWW)

Freeport to Brownsville

Mile Marker Bridge Charted Vert. Clear. Schedule Restrictions VHF
397.6 WHL Freeport/Bryan Beach Bridge 73’ Fixed Bridge    
418.0 WHL Carney Creek Pontoon Bridge 4’ Opens on Demand Small Boat Passage 13
440.7 WHL Market Street Bridge 73’ Fixed Bridge    
533.5 WHL SR 361 Bridge 48’ Fixed Bridge    
552.7 WHL JFK Causeway Bridge 73’ Fixed Bridge    
665.1 WHL Queen Isabella Bridge 73’ Fixed Bridge    
666.0 Port Isabel/Long Island Pontoon Bridge 0’ Opens on Demand   13

The table above lists the bridges, their schedules, and restrictions along the Texas Gulf Intracoastal Waterway from the Sabine River in Texas southwest to the Mexican Border.

This list is believed to be accurate as of January 2021. If any errors or omissions are noted, please e-mail us at with any corrections or recommendations.

This bridge operating schedule can be downloaded for your personal and private use as a ZIP file. The file contains the schedule in Adobe (.pdf) file format.

Texas Gulf Coast Bridge Schedule - Download

GICW/GIWW Bridge and Lock Schedule (Florida to Texas) - Download


Texas Gulf Intracoastal Waterway Locks

Mile Marker Bridge Charted Vert. Clear. Schedule Restrictions VHF
441.1 WHL Colorado East Lock   On Demand Pleasure Craft on the hour. 13
442.0 WHL Colorado West Lock   On Demand Pleasure Craft on the hour. 13

Overhead Power Lines

Numerous overhead cables cross the Texas Gulf Intracoastal Waterway. The minimum authorized clearance of overhead cables crossing the GIWW is 61 feet and is also found at Aransas Pass, TX at (MM 533.1 WHL.)

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.


Tidal ranges are fairly small along the Texas coast. Under normal conditions the mean range of tide averages about less than 1.5’ at Sabine Pass to about 0.5’ at Port O’Conner and across the remainder of the state to Port Isabel.

Texas typically experiences a "Mixed Tide" - exhibiting (2) unequal high and low tides each day.

Texas Entrances, Inlets, and Passes

At last count, in January 2020, there were 15 entrances, inlets, or passes found along the Texas coastline. From Sabin Pass at the Louisiana/Texas Border southwest to the Rio Grande River at the Texas/Mexican Border.

While all of these inlets provide access to sheltered waters, many are dangerously shallow that should not be attempted without local knowledge. All provide direct access to the Gulf Intracoastal Waterway. We have listed them on the next page along with useful information on each to aid you in deciding if you wish to use a particular inlet.

NEXT - Texas Coastal - Entrances, Inlets, & Passes

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