Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the RoadsideSlopePoly 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 roadside slopes as polygons. The roadside slopes are that are documented by the Stormwater Features Inventory Group are limited to those that are designed and/or approved for use as a stormwater best management practice (BMP), such as vegetated filter strips. A roadside slope polygon documents the approximate boundaries of the area designated to act as a BMP.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/27b0fdbce1124088be2ae31d6a1c4ee9_5engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Roadside Slope Type Polygon - BMPs [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06