High winds and waves prevent GIWW sediments transported down the Freshwater and Schooner bayous from settling and forming the basis of vegetated marsh. This same wind and wave energy also increases shoreline erosion rates.
This project involved the construction of a series of vegetated terraces to diminish waves in Little Vermilion Bay, helping to increase sediment deposition and reduce the rate of shoreline erosion. A pattern of channels was dredged 100-feet wide and 6-feet deep to beneficially distribute sediment from the GIWW through the Freshwater and Schooner bayous. Dredged sediments were used to construct 23 earthen terraces with a combined length of 23,300 feet. After settling, the average height of the terraces was 3.5 feet above mean sea level.
The bases of the terraces were planted with 20,450 containers of smooth cordgrass (Spartina alterniflora).
The design allows commercial and recreational fisherman to access the project area, and it stimulates fishery production by creating new habitat and increasing shoreline length.
In 1998 alone (prior to the project’s completion) 40 acres of wetland habitat were created.
This project is located in the northwestern corner of Little Vermilion Bay at its intersection with the Gulf Intracoastal Waterway (GIWW) in Vermilion Parish, Louisiana. The project area encompasses 964 acres.
Monitoring is underway and preliminary observations show that the terraces are growing in width, and bay depth between terraces is decreasing indicating marsh expansion in the project area.
This project is on Priority Project List 5.
The Federal Sponsor is NOAA NMFS
The Local Sponsor is CPRA
On Friday, June 10th, the Vermilion Parish Coastal Protection and Restoration Committee hosted the first Vermilion Parish Coastal Day in Intracoastal City, Louisiana. Joining the Vermilion Parish Coastal Committee was the Vermilion Parish Police Jury and leaders of Louisiana Coastal Protection and Restoration Authority (CPRA). The one-day event was dedicated to educating local landowners, government officials, and the general public on the success of previous coastal restoration projects as well as current coastal issues in hopes of uniting the community to support the progression of coastal efforts within Vermilion Parish.
Ronald Darby, President of Vermilion Parish Policy Jury, and Kevin Sagrera, Chairman of Vermilion Parish Coastal Committee, welcomed Johnny Bradberry, Executive Assistant to the Governor for Coastal Affairs and CPRA Chairman. Bradberry gave brief updates on current bills and legislation pertaining to coastal projects. Michael Ellis, Executive Director of CPRA, discussed the valuable natural resources available in Vermilion Parish. Ralph Libersat of the Vermilion Parish Coastal Committee presented an overview of Vermilion Parish coastal projects, explaining the critical need to protect what is there now, as opposed to having to recreate land years into the future. Libersat discussed the $92 million of coastal project expenditures in Vermilion Parish to date:$70 million from CWPPRA, $18 million from Vermilion Parish, and $3.4 million from surplus funding, giving a conservative total net benefit of 5180 acres. Libersat highlighted a few CWPPRA projects such as ME-31, TV-12, TV-18, TV-63, and TV-03; Libersat continued by expressing that Vermilion Bay is losing wetlands at a rate of 8-10 feet per day.
Following lunch was a site visit to two restoration project areas along Freshwater Bayou and Vermilion Bay. The first project site was Freshwater Bayou Marsh Creation (ME-31), located west of Freshwater Bayou and north of the Freshwater Bayou Locks; this project is in the Engineering and Design phase to create and/or nourish approximately 401 acres of marsh using dredged material. The second project site was Little Vermilion Bay Sediment Trapping (TV-12), located in the northwestern corner of Little Vermilion Bay at its intersection with the Gulf Intracoastal Waterway (GIWW); this project has been completed and was successful in shoreline protection and sediment trapping with terraces.