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Shoreline Protection Studies for Mad Island Marsh Prepare the Way for GIWW Revetment
Southwest Region, March 31, 2005
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Staff at the Clear Lake Field Office assisted Galveston District Corps staff in developing Wetland Value Assessment (WVA) models to assess project benefits for the 6.5-mi Mad Island GIWW Shoreline Restoration project. This Continuing Authority Project (CAP), originally initiated by Service and Corps biologists in 2002, is designed to protect from shoreline erosion and salinity intrusion approximately 2,400 acres of some of the highest-quality remaining intermediate and brackish marsh systems remaining along the central Texas coast. In addition approximately 100 acres of the northernmost Tamaulipan scrub/shrub habitat in Texas lies directly adjacent to the GIWW here and will be protected. Recent estimates are that the GIWW erodes at the rate of 2.5 to 5 feet per year and threatens the productivity of these important marshes by allowing high-salinity waters through the shoreline barriers. The tracts to be protected belong to Texas Parks and Wildlife Department (Mad Island WMA) and Texas Nature Conservancy (Mad Island TNC Preserve). Texas Nature Conservancy has recently allocated over $1 million as its local cost-share, and the Corps? CAP program has identified funds for the project. Corps? guidelines now require quantification of project habitat benefits using established habitat evaluation methods and incremental analysis of benefits. Therefore the WVA modeling method, as developed for the Louisiana CWPRA project review, was chosen and is being directed by Service participation.

Contact Info: Martin Valdez, 505-248-6599, martin_valdez@fws.gov



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