Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the RoadsideSlopeLine 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 lines. 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 line documents the top portion of the slope as it extends along a state route.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/ee64bb0bb79a4ab6a1d2ff1afd5c4e66_4engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Roadside Slope Type - BMPs [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06