U.S. Fish & Wildlife ServiceThis webmap displays the ~1935 historical extent of Grand Lake in the Atchafalaya Basin based on available historic topographic and survey maps. The Atchafalaya Basin is a resource that must be managed on a system-wide basis to ensure this invaluable national resource is protected and restored. It is recognized that better tools must be developed for managing the Basin and that data evaluation is necessary to ensure sound decision-making. The natural resource inventory and assessment system (NRIAS) that was approved and funded in the FY 2010 Louisiana Department of Natural Resources Atchafalaya Basin Program Annual Plan and served as the primary tool for decision making in the Basin. The system provided a means for scientists to access relevant project data for the Basin and to request and fund data acquisition, monitoring, and data analysis to be used in project planning. This will be critical in providing information necessary for the development and approval of specific projects to be included for construction in future Annual Plans, projects that meet the needs of Louisiana citizens and protect our our natural resources. This and related datasets were created to demonstrate the patterns of inundation, turbid water and floating aquatic vegetation in the Atchafalaya Basin Floodway System at various river levels of the Atchafalaya River.ArcGIS ImageMapLayerhttps://hub.arcgis.com/datasets/70c18bf84e0f41c0bccc4c8838888172engU.S. Fish and Wildlife Service Open DataPublicGrand Lake Extent 1935 [United States]Web servicesUnited States1935