Clark County, WashingtonDrainage Districts oversee funding, construction and maintenance of flood control measures such as levies and drainage systems. They are authorized to sell bonds and levy tax assessments for funding and are managed by a board of commissioners. Washington counties are authorized to establish drainage districts by the state legislature in 1895 and are formed by citizen petition. See Clark County MetadataArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/5cf4497f896247a8af535c855c44d497_0engClark County Open DataPublicDrainage Districts [Washington (State)--Clark County]Web servicesWashington (State)--Clark CountyWashington (State)Last Modified: 2026-01-07