NAME OF APPLICANT: United States Fish and Wildlife Service, c/o Louisiana Coastal Protection and Restoration Authority, Attn: Sydney Dobson, P.O. Box 44027, Baton Rouge, Louisiana 70804.
LOCATION OF WORK: In Lost Lake, Bayou DeCade, and Carencro Bayou, Sections 1, 2, 3, 4, 5, 6, 20, 21, 28, 29, 32, 33, and 34, T19 and 20S-R14E, approximately 23 miles southwesterly from Houma, Louisiana, in Terrebonne Parish, within the West Central Louisiana Coastal Basin in hydrologic unit (HUC 08090302), as shown on the attached drawings.
CHARACTER OF WORK: The applicant has requested Department of the Army authorization to hydraulically dredge Lost Lake and provide material for 643 acres of marsh creation in eight (8) different areas to include terraces. Additionally, five (5) fixed crest weir structures will be replaced with variable crest structures to improve hydrology within two (2) of the semi-impounded marsh creation areas. A dredge pipeline will be installed temporarily for the movement of the dredged material to the marsh creation areas. A permit for the primary activity was issued on February 24, 2014 and modified on November 24, 2014. The following items are additional modifications to the original authorization. The applicant will add three (3) new areas of creation, modify the location of four (4) terraces, one (1) control structure will be extended, dykes will be modified to increase slope stability, one of the creation areas will be split into two sections to avoid a pipeline, a switch will be made from semi contained dykes to full earthen containment dykes, the depth of the dredged access channel will be increased by dredging, and the dredge pipeline will be buried under Bayou Decade and floated on pontoons to cross Whitson Pipeline and the rock revetment at Bayou Decade. Approximately 8,699,041.25 cubic yards of material will be dredged and deposited in areas of degraded marsh for marsh re-creation and construction of terraces covering 643 acres.
A Preliminary analysis has determined that the proposed project would temporarily impact 608 acres of jurisdictional waters bottoms at the project site.
The applicant has designed the project to avoid and minimize direct and secondary adverse impacts to the maximum extent practicable. The purpose of the project is to create marsh and further protect additional marsh from erosion, therefore not mitigation will be required.