Snohomish County Public Works Surface Water ManagementCulverts are pipes that allow for the flow of storm or natural water under roads and driveways. Some culverts are designed specifically to mimic natural streambed conditions to allow for passage of migratory fish. They are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/7f469e6653c24b92a66c0379ce1a7e69_0engSnohomish County Open Data PortalPublicCulvert [Washington (State)--Snohomish County]Web servicesWashington (State)--Snohomish CountyWashington (State)Last Modified: 2022-11-09