Delta Management at Fort St. Philip (BS-11)

Since the crevasse, the area has been in a state of transition. It was once an organic, low-energy system consisting of brackish-saline marsh and was in decline. After the crevasse, it became a deltaic environment dominated by the formation of fresh and intermediate marshes.

GIS analysis indicates that marsh loss has decreased considerably in the project area, and marsh building has begun to occur. Many areas that historically experienced marsh loss were becoming shallower with the introduction of river sediments.

Emergent marsh has been forming throughout the area on the newly accreted mineral soils. Even though this area has experienced a net gain in emergent marsh, this project will enhance the natural marsh-building processes and increase the growth rate of emergent wetlands.

The project included the construction of terraces in open water habitat and the construction of six crevasses to increase marsh-building processes.

The terraces were planted with seashore paspalum (Paspalum vaginatum) and smooth cordgrass (Spartina alterniflora).

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The project is located on the east side of the Mississippi River near the crevasse (a break in the levee) that formed during the 1973 flood at Fort St. Philip in Plaquemines Parish, Louisiana.

The construction contractor mobilized to the project site in June 2006. A barge-mounted bucket dredge was used to construct the crevasses while marsh-buggy backhoes constructed the terraces. The six crevasses were completed in August 2006 with completion of the terraces in November 2006. A final inspection was conducted on December 4, 2006.

This project is on Priority Project List 10.

The Federal Sponsor is USFWS

The Local Sponsor is CPRA

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