Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the FlowRestrictor featureclass created with the following query: LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) AND (SWLocationVerified IS NULL OR SWLocationVerified = 'No') This feature class contains WSDOT's stormwater flow restrictors. A flow restrictor is a device such as an orifice or weir that restricts the volume of stormwater flow through or at the outlet of a structure. It may be associated with a "control structure" as part of a "flow restrictor system" (see Standard Plans B-10.40, B-10.60). 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/b3ff47554e10444d8c3b2a1ad4d08370_0engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Flow Restrictor - Office [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06