Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the ditch featureclass created with the following query: WHERE NOT ( BMPTypeID = 24 OR BMPTypeID IS NULL OR BMPTypeID = 31) AND LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) This feature class contains WSDOT's stormwater ditches.A stormwater ditch is a long, narrow excavation dug in the earth for drainage, having a top width less than 10 feet at design flow. This can include various linear conveyances constructed of rock, gravel, earth, concrete, asphalt, or other material using forms, machinery, etc. It can also include a convergence in gradients of impervious surfaces (e.g., in a parking lot) designed to concentrate and convey stormwater.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/47a46b31f4954a3c8555963fd539aa96_3engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Ditch Type - BMPs [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06