Island County GISIsland County Watersheds used for the Surface Water Quality Monitoring Program. This layer does not include coastal drainages and smaller watersheds. This layer was created in the Planning Department using 2001 LiDAR between 2005 and 2008. Ground truthing edits were made through 2012.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/5c885603df4a490eaee871064844601b_0engIsland County Open Data PortalPublicWatersheds [Washington (State)--Island County]Web servicesWashington (State)--Island CountyWashington (State)Last Modified: 2026-01-08