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SWG-2018-00490 - The Nature Conservancy - Gulf Intracoastal Waterway - Matagorda County, Texas

Published Jan. 24, 2019
Expiration date: 2/25/2019
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Full Public Notice          Project Plans

PROJECT DESCRIPTION:  The applicant proposes to construct a living shoreline/breakwater to stabilize and protect approximately 12,000 feet (2.3 miles) of TNC’s Mad Island Marsh Preserve bank and shorelines along the GIWW with a base width of 34 feet and a height above the bottom of 4 feet.  The structure will be placed with TNC’s Mad Island Marsh Preserve and Texas Parks and Wildlife Department’s Mad Island WMA properties meet and extend westward ending at the west boundary of TNC Property.  The breakwater will be placed at variable distances from 160 to 225 feet from the centerline of the GIWW and located landward of the designated GIWW offset boundary.  The proposed bank stabilization would result in the discharge of approximately 32,160 cubic yards of limestone or clean concrete rubble as reef material over approximately 8.6 acres.  The length of the shoreline to protected is 12,300 feet and will include 10,300 feet of living shoreline to be constructed in 10 segments of different lengths with length determined by locations of marsh to be protected.  These segments would be separated by 10, 100-foot-wide gaps to allow tidal exchange and ingress and egress of marine organisms between marsh behind the breakwater and the GIWW.  The breakwater will incorporate a 3H:1V side slope.

Also, an underwater rock sill with be placed at the mouth of the Mad Island Bayou breakwater gap to prevent further scouring of the mouth and bank erosion, and will be the width of the bayou mouth at the time of construction.  The rock sill will not impede access to the bay by boat.  Reefblk was installed as bank stabilization around the mouth of the bayou in 2007.  The Reefblk currently contains oysters.  The project proposes relocating these damaged sections of Reefblk to areas to keep the oyster alive, provide shoreline protection and avoid interference with recreational or commercial navigation in the bayou or the GIWW.  It will incorporate 1,000 feet of previously installed Reefblk material and 1,000 feet of 10, 100-foot wide gaps.  Gaps will allow tidal exchange and the ingress and egress of marine organisms between marsh behind the breakwater and the GIWW.