Pierce County, WashingtonPolylines representing closed water conveyance storm drainage pipes in the storm water network of unincorporated Pierce County. Includes public and private features except where private gates prevent access. Please read metadata ( https://matterhorn.piercecountywa.gov/GISmetadata/pdbpubw_swmainline.html ) for additional information. Any data download constitutes acceptance of the Terms of Use ( https://matterhorn.piercecountywa.gov/Disclaimer/PierceCountyGISDataTermsofUse.pdf ).ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/9efd518087684d3abb7706084a5ddd64_0engPierce County Open GeoSpatial Data PortalPublicDrainage Main Lines [Washington (State)--Pierce County]Web servicesWashington (State)--Pierce CountyWashington (State)Last Modified: 2025-12-17