City of Tacoma GISSurfacewater subbasin outlines and areas. Subbasins are polygon features which are a breakdown of a basin into smaller tributary areas draining to one location. Contact: Vanessa Simpson, IT Analyst, Senior Technical (GIS) vsimpson@cityoftacoma.orgArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/9d497a1c83b64e0c83c7a376aca59360_41engTacoma Open DataPublicSurfacewater Subbasins (Tacoma) [Washington (State)--Tacoma]Web servicesWashington (State)--TacomaWashington (State)Last Modified: 2025-10-01