Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the StormwaterPondPoly featureclass created with the following query: WHERE LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) This feature class contains WSDOT's stormwater ponds as polygons. There are various types of stormwater treatment ponds which provide treatment and flow control by containing excess runoff for a considerable length of time and then releasing it by evaporation, plant transpiration, or infiltration; or holding surface and stormwater runoff for a short period of time and then releasing it to a surface or stormwater management system. Stormwater pond polygons approximate the pond boundaries at maximum water level.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/dff6e0c9f71f4f2bb5c5a8f799c8d6db_6engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Pond - BMPs [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06