Gulf Intracoastal Waterway
Hwy. 1 Intracoastal Boat Launch
—Atchafalaya Water Heritage Trail —
The Port Allen Lock connects the Gulf Intracoastal Waterway and the Gulf of Mexico to the Port of Greater Baton Rouge and other points north along the Mississippi River, shortening the distance for boat traffic about 120 miles.
The Intracoastal Waterway System is a 3,000-mile inland waterway system that was established to improve shipping routes in the U.S. and provide boats protection from the hazards of the sea. It is maintained by the U.S. Army Corps of Engineers.
As a segment of the Intracoastal Waterway System, the Gulf Intracoastal Waterway stretches for more than 1,300 miles along the entire coast of the Gulf of Mexico from Apalachicola, Fla., to Brownsville, Texas. It is made up of both natural waterways and canals. Like the rest of the system, the GIWW is used for both recreational and commercial purposes, with branches that connect it to critical ports. The Port Allen Lock is one such branch that connects the waterway and Gulf of Mexico to the Port of Greater Baton Rouge and other points north along the Mississippi River, shortening the distance for boat traffic by about 120 miles. This branch leaves the GIWW in the Atchafalaya River at Morgan City and proceeds north through the Atchafalaya Basin, exiting the floodway through the Bayou Sorrel Lock and continuing the rest of the way to Baton Rouge.
Though it was built to serve navigation, the Port Allen Lock can also be used for flood and pollution control because it can be opened or sealed shut. In 2005, the Port Allen Locks were opened temporarily to allow Mississippi River water to flow through the Lake Verret and Lake Palourde systems further south, flushing out salt water and organic material that had been pushed in by storm surge and heavy rains and winds from Hurricane Rita.
The flood stage at this Mississippi River location is 35 feet, compared to 48 feet upriver at Vidalia and 17 feet downriver at New Orleans.
Visit Atchafalaya.org for more information about this site.
This site’s geology/geomorphology: Holocene natural levee deposits of Mississippi River
Erected by State of Louisiana and National Park Service.
Location. 30° 25.963′ N, 91° 12.653′ W. Marker is in Port Allen, Louisiana, in West Baton Rouge Parish. Marker can be reached from Ernest Wilson Drive when traveling south. Touch for map. Highway 1 overpass. Marker is in this post office area: Port Allen LA 70767, United States of America.
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. Oaks Plantation (approx. 1.2 miles away); William Bartram Trail (approx. 1.3 miles away); U.S.S. Kidd (approx. 1.4 miles away); USS KIDD - "DD 661" (approx. 1.4 miles away); John Archer Lejeune (approx. 1.4 miles away); USCGC White Alder (approx. 1.4 miles away); Korean War Memorial (approx. 1.4 miles away); Louisiana Vietnam War Memorial (approx. 1½ miles away).
More about this marker. Marker is located under the Highway 1 Overpass, at the Gulf Intracoastal Waterway public boat launch.
Categories. • Environment • Waterways & Vessels •
Credits. This page was last revised on December 23, 2017. This page originally submitted on December 23, 2017, by Cajun Scrambler of Assumption, Louisiana. This page has been viewed 78 times since then and 26 times this year. Photos: 1, 2, 3, 4. submitted on December 23, 2017.