The Mississippi River's watershed measures 1.85 million square miles, or 41 percent of the U.S., from the crest of the Appalachian Mountains to the crest of the Rocky Mountains.
One of the longest rivers in North America, the Mississippi flows 2,340 miles from Lake Itasca, Minn., to the Gulf of Mexico 100 miles below New Orleans, and its floodplain encompasses more than 30 million acres. The river has more than 250 tributaries, but most of its connections in Louisiana are distributaries that spread water and silt across broad areas, enriching agricultural land on both sides of the waterway.
The Mississippi’s watershed measures 1.85 million square miles, or 41 percent of the U.S. Geographically, this spans from the crest of the Appalachian Mountains to the crest of the Rocky Mountains, encompassing 31 states and two Canadian provinces. The river is divided into three sections—Upper Mississippi, Middle Mississippi and Lower Mississippi. The lower section encompasses from the Ohio River to the Gulf of Mexico, where the Mississippi is a mile wide at some points. This section is bound by high bluffs and man-made levees adjacent
The Mississippi has shifted its course many times in geologic history. Its current basin was shaped by the Laurentide Ice Sheet, which ended with the last ice age about 11,700 years ago. The current course dates to about 800 to 1,000 years ago, when the river shifted from the Lafourche Delta.
The section of the waterway between Vidalia and Natchez was an important crossing point for early settlers and a docking place for flatboats, steamboats and other forms of water transportation. After the Flood of 1927, the U.S. Army Corps of Engineers undertook a massive effort to construct levees, outlets and control structures that would prevent future catastrophic flooding in the lower Mississippi River region. To expand the levee system in Vidalia, the entire city was moved a mile west in 1938. The current waterfront river walk was built on an old abandoned downtown street, and the first bridge here was constructed in 1940, when automobile and truck transportation were becoming increasingly important to the American economy.
Looking across the Mississippi River from Vidalia, visitors can see the bluffs on which Natchez was built. They are made of loess soils blown into place millennia ago and provide the high elevation that protects the city from floodingwhen the river rises. Due to this soil’s highly erodible nature, the opposite bank of the Mississippi both upstream and downstream from Natchez is full of substantial gullies and ravines that empty into the river. The Mississippi’s flood stage in this area is 48 feet, compared to 27 feet downriver at Donaldsonville and 17 feet at New Orleans.
Visit Atchafalaya.org for more information about this site.
This site’s geology/geomorphology: Holocene meander-belt (point bar and overbank) deposits of the Mississippi River
Erected by State of Louisiana and National Park Service.
Topics and series. This historical marker is listed in these topic lists: Environment • Waterways & Vessels. In addition, it is included in the Atchafalaya Water Heritage Trail series list.
Location. 31° 33.813′ N, 91° 25.279′ W. Marker is in Vidalia, Louisiana, in Concordia Parish. Marker can be reached from Front Street. Touch for map. Marker is in this post office area: Vidalia LA 71373, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. James Bowie (within shouting distance of this marker); Great Mississippi River Flood of 1927 (within shouting distance of this marker); Post of Concord Established (about 600 feet away, measured in a direct line); Relocation of Vidalia
More about this marker. Located on the Vidalia Landing Riverwalk, just to the north of the Vidalia Conference & Convention Center building.
Credits. This page was last revised on July 7, 2018. It was originally submitted on July 7, 2018, by Cajun Scrambler of Assumption, Louisiana. This page has been viewed 112 times since then and 22 times this year. Photos: 1, 2. submitted on July 7, 2018.