SWG-2008-00352 - Jefferson County Drainage District No. 6 - Jefferson and Chambers Counties

Full Public Notice     Project Plans     Restoration Plan

PROJECT DESCRIPTION:  The applicant will impact 16.39 acres of waters of the U.S., of which 15.43 acres are open water, 0.47 acre is coastal marsh, and 0.49 acre is unvegetated flats, with this proposed project.  The applicant will impact these waters of the U.S. with 5.94 acres of excavation activities and 10.45 acres of fill activities.  The applicant proposes to relocate the four existing outfalls from their current upstream location downstream to near the confluence of the bayous and the GIWW to reduce sedimentation within the canals and reduce current and future maintenance dredging.  The applicant will place riprap along the banks downstream of the constructed outfalls and along the shoreline of the GIWW below the mean high tide line.  The applicant proposes to reconstruct the existing canals by using the previously created dredged material levees as fill material to reduce the existing canal width from 80 to 120 feet wide to the newly proposed 50 feet wide and to create the new levees needed with the reduced canal.  The newly formed canals will also be dredged to a depth of 4 feet deep.  The areas that are currently upland levees will be restored to prior contours and elevations consistent with the adjacent coastal wetlands and will be planted with native coastal marsh species.  The outfall structures consist of vinyl sheet and timber pilings, aluminum box culverts, aluminum flap gates, and access roads over the constructed structures.