U.S. Fish & Wildlife ServiceThis layer shows 21 of the larger impoundment areas of which have structures that are capable of spilling into tidal systems. These only include the coastal impoundments of significant size in which are managed by F&W and are either entirely owned by F&W and/or a combination of F&W/Private ownership in which F&W is responsible for the management of water levels. This layer shows 21 of the larger impoundment areas of which have structures that are capable of spilling into tidal systems. These only include the coastal impoundments of significant size in which are managed by F&W and are either entirely owned by F&W and/or a combination of F&W/Private ownership in which F&W is responsible for the management of water levels.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/bde4263c74124688bf659f573f300378_0engU.S. Fish and Wildlife Service Open DataPublicFWS ACJV DE FW Impoundments [United States]Web servicesUnited StatesLast Modified: 2026-01-15