Mississippi River

Mississippi River (HM25MO)

Location: New Roads, LA 70760 Pointe Coupee Parish
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Country: United States of America
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N 30° 45.062', W 91° 23.871'

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Inscription

New Roads Old Ferry Landing

—Atchafalaya Water Heritage Trail —

Significant prehistoric flooding in this area of the Mississippi River occurred through the breaches in the river's natural levees along the Pointe Coupée coast, which was vulnerable to erosion and overtopping by floodwaters.The "Old Ferry Landing" was the western boarding location of the New Roads/St. Francisville Ferry, a service connecting LA Hwy. 10 across the Mississippi River. A series of toll ferries existed at this location beginning in the 1820s, followed by a 35-car ferry from 1956 to 2011. The Mississippi River Flood of 2011 ended nearly 200 years of ferry service here and prompted the early opening of the nearby John James Audubon Bridge, the longest cable-stayed bridge in the Western Hemisphere.

This landing is near the eastern end of a French colonial settlement called the Pointe Coupée Coast. One of the first permanent settlements in the entire Mississippi River valley—dating to about 1727—it extended along the high natural levee landform on the Mississippi's west bank to the north of present-day Morganza.

Seasonal or regional weather-related high water (such as tropical systems and stalled fronts) often caused large-scale flooding in the Mississippi River valley. Much of the prehistoric flooding in this area occurred through breaches, or crevasses, in the river's natural



levees along the Pointe Coupée Coast, which was located on the outside edge of a curve, or cut bank, of the river. Flow rates here are concentrated, making the natural levees vulnerable to erosion and overtopping by floodwaters. According to recent research, 1,804 feet of land in this area eroded into the river during a 150-year period.

When flooding from these crevasses inundated the expansive Mississippi and Atchafalaya floodplains, the Pleistocene terraces on either side became the banks of the Mississippi—allowing the river to become as wide as the distance between Baton Rouge and Lafayette. These deluges covered an area from here to the coastal delta plain at the Gulf of Mexico.

By constructing a system of primitive levees, early landowners attempted to limit flood damage to local property. Regardless, the river broke through these man-made protections at crevasses during periods of extremely high water, just as it had broken through the natural levees. Crevasses along the Pointe Coupée Coast allowed destructive floodwaters to enter the local area and the 11 parishes south toward the Gulf. The Scott crevasse, through which floodwaters poured in 1867 and 1882, is still visible at a large curve in the road about a mile west of the Old Ferry Landing. In 1882, floodwaters from this crevasse almost directly entered False River, resulting in water levels four feet



above Main Street in New Roads.

The Mississippi River overflowed and flooded frequently—sometimes annually—through crevasses along the Pointe Coupée Coast, especially at the "Grand Levee" area several miles upriver near present-day Morganza. This levee was so important for the region that its repeated failure in the 1840's and 1850's was a catalyst for public funding of levee construction in Louisiana.

Visit Atchafalaya.org for more information about this site.
This site's geology/geomorphology: Holocene meander-belt (point bar) deposits of Mississippi River
Details
HM NumberHM25MO
Series This marker is part of the series
Tags
Placed ByState of Louisiana and National Park Service
Marker ConditionNo reports yet
Date Added Friday, February 23rd, 2018 at 7:01pm PST -08:00
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Locationbig map
UTM (WGS84 Datum)15R E 653356 N 3403107
Decimal Degrees30.75103333, -91.39785000
Degrees and Decimal MinutesN 30° 45.062', W 91° 23.871'
Degrees, Minutes and Seconds30° 45' 3.7199999999999" N, 91° 23' 52.26" W
Driving DirectionsGoogle Maps
Area Code(s)225
Closest Postal AddressAt or near LA-981, New Roads LA 70760, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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