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MVN-2013-01561-CQ

Published Aug. 12, 2019
Expiration date: 9/10/2019
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NAME OF APPLICANT:  Coastal Protection and Restoration Authority, Attn: Elizabeth Davoli, 150 Terrace Avenue, Baton Rouge, Louisiana 70802

LOCATION OF WORK:  Located on an approximate 270-acre site, in Multiple Sections, Township 11 South, Range 6 East, left descending bank of the Mississippi River, river mile 144, with associated guide levees and conveyance channel extending northerly for approximately 5.5 miles into the Maurepas Swamp, near Garyville, Louisiana, located in Ascension Parish, as shown on the enclosed drawings (Latitude 30.0509333 N Longitude -90.6434778 W).  This project is located in the Pontchartrain Basin – Amite River watershed (HUC 08070202).

CHARACTER OF WORK:  The applicant is requesting a Department of the Army permit authorization to clear, grade, excavate, place and maintain fill material for the construction of the Mississippi River Reintroduction into Maurepas Swamp (CWPPRA PO-29).  The project would consist of the excavation of an intake channel in the Mississippi River batture, a gated structure would be built through the levee, and three 10' x 10' box culverts would be installed to convey river water under the levee and River Road.  The culverts would discharge into a large sand settling basin, connected to a 5.5 mile long banked conveyance channel, which would divert flow to the Maurepas Swamp.  Four 8' x 8' box culverts will be installed to cross under the Canadian National Railway, a bridge will be constructed over the Kansas City Southern Railway and six 9’ x 9’ box culverts will be installed to cross under US Hwy. 61.  As the conveyance channel proceeds north of US Hwy. 61, the channel would follow the existing Hope Canal alignment to ultimately distribute the diverted water into the wetlands 1,000' north of Interstate 10.  Rock weirs would be installed at Blind River, Bourgeois Canal and Bayou Secret. Five cuts would be created in the abandoned railroad embankment north of Interstate 10 and east of Blind River.  Ten check valves would be installed on the north side of Interstate 10 on the existing culverts under the interstate.  Approximately 1,025,808 cubic yards of native material would be excavated and disposed of off-site; 472,441 cubic yards of topsoil/dirt; 85,340 cubic yards of soil/cement mixing; 10,344 cubic yards of crushed stone/gravel; 4,400 cubic yards of rock and 700 cubic yards of concrete would be hauled in from offsite sources and placed as fill as a result of project implementation. Approximately 160 acres of wetland habitat and 20 acres of non-vegetated waterbottoms may be impacted as a result of this proposed activity. The applicant has claimed that the project has been designed to avoid and minimize direct and secondary adverse wetland impacts to the maximum extent practicable while providing the maximum hydrologic restoration benefit target area to Maurepas Swamp habitat.  The applicant is proposing to utilize best management practices during and after the construction phase of the project.  The applicant has designed this project as a hydrologic restoration project and has claimed that the project is self-mitigating due to anticipated project benefits to approximately 36,120 acres of swamp habitat, therefore compensatory mitigation is not anticipated.  


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