The Gulf Intracoastal Waterway (GIWW [1]) is the portion of the Intracoastal Waterway located along the Gulf Coast of the United States. It is a navigable inland waterway running approximately 1,300 mi (2,100 km) [1] from Saint Marks, Florida, to Brownsville, Texas.

In June 2016, after several years of collaboration with TxDOT, the U.S. Maritime Administration designated the GIWW-T as Marine Highway 69. This designation allows TxDOT and Texas ports to apply for America’s Marine Highway Program grant funding for projects that increase waterborne transportation along the corridor.

Our mission is to facilitate commerce through ensuring safe, reliable, and efficient Gulf Coast waterways. Our Vision, GICA the Voice of the GIWW and its users. LEARN MORE.

BACKGROUND: The Texas portion of the Gulf Intracoastal Waterway (GIWW) navigation project consists, generally, of a 12-ft deep by 125-ft wide by approximately 423 mile long...

The Gulf Intracoastal Waterway (GICW/GIWW) provides the mariner with an almost continuous, and protected passage just inside the Gulf of Mexico Coastline. Beginning at Mile Marker (MM "0.0") in San Carlos Bay near Punta Rassa, FL at 26°30.6’ N / 82°01.1’ W, and extending to Brownsville, TX (MM "681.5 WHL") at 25°57.0’ N / 97°24.1’ W.

Gulf Intracoastal Waterway (GIWW) Overview. Overview Data Image Management Visualization Preview Preview Tasks Snapshots Layers Usage Settings. This layer is editable and shared with the public. To prevent unwanted editing, unshare this item or approve it for public data collection.

Measuring 1,100 miles long, the GIWW is a shallow manmade protected waterway that connects ports along the Gulf of Mexico from Florida to Texas, and is a vital component of the state's and the nation's transportation network.

The Gulf Intracoastal Waterway (GIWW) is often referred to as the most remarkable artery of transportation in America. Linking deep-water ports, tributaries, rivers...

The Gulf Intracoastal Waterway (GIWW) serves a vital transportation purpose along the Gulf of Mexico coastline. The goal of the GIWW, which was approved by Congress in the Harbors and Rivers Act of 1925, was to construct a navigable inland waterway that was shielded from waves and storms and suitable for use by shallow draft boats.

The Gulf Intracoastal Waterway (GIWW) stands as a testament to a nation’s commitment to uniting her states and people in regular commerce. Stretching over a thousand miles, the GIWW’s creation was a journey that spanned decades, driven by visionary leaders, military necessity, economic potential, and engineering prowess.