WSDOT ESO Wetlands ProgramThis is a polygon layer showing the spatial extent of WSDOT owned mitigation sites that will be updated annually. Accuracy is limited to best information available, so varies from site to site. Data was gathered from .dgn files, georeferenced plan sheets, and/or aerial photos. This is intended to be as complete of an inventory as possible of all WSDOT owned environmental mitigation sites. Last Updated May 2023.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/b6bda0e1886f4619952cda1be6f703b8_1engState of Washington Geospatial Open Data PortalPublicWSDOT - Environmental Mitigation Sites [Washington (State)]Web servicesWashington (State)Last Modified: 2025-10-07