Atchafalaya in St. Martin Parish, Louisiana — The American South (West South Central)
Atchafalaya River
Atchafalaya Welcome Center
— Atchafalaya Water Heritage Trail —
Photographed By Cajun Scrambler, February 16, 2018
1. Atchafalaya River Marker
Inscription.
Atchafalaya River. Atchafalaya Welcome Center. , The levee that surround this section of the lower Atchafalaya Floodway are about 15 miles apart and were built in the 1930s. Their construction- and the straightening of the Atchafalaya River in this area- forever changed the Atchafalaya Basin.
The Atchafalaya Basin is one of the most extensive river-floodplain systems in the world. It is also an important floodway system made up of three individual sections, the West Atchafalaya Floodway, the Morganza Floodway and the Lower Atchafalaya Floodway, all which help protect millions of Americans from flooding. The system is surrounded by levees that direct water from the Mississippi River through the Basin to the Gulf of Mexico. It regulates the combined flow of the Red and Mississippi rivers down the Atchafalaya River at the Old River Control Structure near Simmesport and was designed to handle half of the Project Design Flood, the maximum probable Mississippi River flood.
The levees that surround this section of the Basin (the Lower Atchafalaya Floodway) are about 15 miles apart and were built in the 1930s. Their construction, and the straightening of the Atchafalaya River in this area, forever changed the Basin, both inside and outside the floodway. The river’s new main passage, for example, follows the man-made Whiskey Bay Pilot Channel, while the previous channel through Butte La Rose is silting in. Additionally, some historic segments were cut off by the levees and others were intentionally closed to force the bulk of Basin water down the new channel, making it wider and deeper in compliance with the flood control mandate. This also improved river navigation.
Building levees increased the height of flooding inside the Basin and removed some traditional drainage paths from adjacent areas. Higher flood levels inside the levees also forced permanent migration of residents from small communities such as Atchafalaya, which sprouted in the early 1900s (where the I-10 Butte La Rose exit is now) to support the Southern Pacific Railroad bridge (destroyed in the Flood of 1927) between Lafayette to Baton Rouge.
Low areas outside the levees also saw increased flooding as rainwater in upper parts of the traditional Basin moved through a restricted path and land subsided without annual replenishment from river sediment. By the 1970s, deltas in the floodway’s lakes were largely complete. During the Mississippi River Flood of 1973, a new Atchafalaya Delta began emerging far downstream in Atchafalaya Bay. It continues to grow.
The 18-mile Interstate 10 bridge was completed in the 1970s, connecting both sides of the Basin once again. Today, this biodiverse wetland is a source of livelihood for many fishermen and hunters, and a recreation destination for others. It is host to the largest block of forested wetlands in the lower Mississippi River valley, the largest block of coastal cypress forest in the U.S., and is a habitat for more than 85 species of fish and almost 300 species of resident and migratory birds. Challenges to sustaining this area include hydrology effects, sedimentation, invasive species and resource extraction.
Visit Atchafalaya.org for more information about this site.
This site’s geology/geomorphology: Holocene natural levee deposits of Atchafalaya River
The levee that surround this section of the lower Atchafalaya Floodway are about 15 miles apart and were built in the 1930s. Their construction- and the straightening of the Atchafalaya River in this area- forever changed the Atchafalaya Basin.
The Atchafalaya Basin is one of the most extensive river-floodplain systems in the world. It is also an important floodway system made up of three individual sections—the West Atchafalaya Floodway, the Morganza Floodway and the Lower Atchafalaya Floodway—all which help protect millions of Americans from flooding. The system is surrounded by levees that direct water from the Mississippi River through the Basin to the Gulf of Mexico. It regulates the combined flow of the Red and Mississippi rivers down the Atchafalaya River at the Old River Control Structure near Simmesport and was designed to handle half of the Project Design Flood, the maximum probable Mississippi River flood.
The levees that surround this section of the Basin (the Lower Atchafalaya Floodway) are about 15 miles apart and were built in the 1930s. Their construction—and the straightening of the Atchafalaya River in this area—forever changed the Basin, both inside and outside the floodway. The river’s new main passage, for example, follows the man-made Whiskey Bay Pilot Channel, while the
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previous channel through Butte La Rose is silting in. Additionally, some historic segments were cut off by the levees and others were intentionally closed to force the bulk of Basin water down the new channel, making it wider and deeper in compliance with the flood control mandate. This also improved river navigation.
Building levees increased the height of flooding inside the Basin and removed some traditional drainage paths from adjacent areas. Higher flood levels inside the levees also forced permanent migration of residents from small communities such as Atchafalaya, which sprouted in the early 1900s (where the I-10 Butte La Rose exit is now) to support the Southern Pacific Railroad bridge (destroyed in the Flood of 1927) between Lafayette to Baton Rouge.
Low areas outside the levees also saw increased flooding as rainwater in upper parts of the traditional Basin moved through a restricted path and land subsided without annual replenishment from river sediment. By the 1970s, deltas in the floodway’s lakes were largely complete. During the Mississippi River Flood of 1973, a new Atchafalaya Delta began emerging far downstream in Atchafalaya Bay. It continues to grow.
The 18-mile Interstate 10 bridge was completed in the 1970s, connecting both sides of the Basin once again. Today, this biodiverse wetland is a source of livelihood for many fishermen and hunters,
Photographed By Cajun Scrambler, February 16, 2018
2. Atchafalaya River Marker and Welcome Center
and a recreation destination for others. It is host to the largest block of forested wetlands in the lower Mississippi River valley, the largest block of coastal cypress forest in the U.S., and is a habitat for more than 85 species of fish and almost 300 species of resident and migratory birds. Challenges to sustaining this area include hydrology effects, sedimentation, invasive species and resource extraction.
Visit Atchafalaya.org for more information about this site.
This site’s geology/geomorphology: Holocene natural levee deposits of Atchafalaya River
Erected by State of Louisiana and National Park Service.
Location. 30° 20.498′ N, 91° 43.373′ W. Marker is in Atchafalaya, Louisiana, in St. Martin Parish. Marker can be reached from the intersection of Atchafalaya River Highway (State Highway 3177) and Interstate 10. Touch for map. Marker is at or near this postal address: 1908 Atchafalaya River Highway, Breaux Bridge LA 70517, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within 10 miles of this marker, measured as the crow flies. Louisiana Airborne Memorial Bridge (within shouting distance
Credits. This page was last revised on June 2, 2023. It was originally submitted on February 18, 2018, by Cajun Scrambler of Assumption, Louisiana. This page has been viewed 278 times since then and 9 times this year. Photos:1, 2. submitted on February 18, 2018.
