In partnership with the Washington State Association of Counties (WSAC) and the Washington State Department of Transportation’s Highways and Local Programs (HLP), the Washington Department of Fish and Wildlife (WDFW) inventoried, assessed, and prioritized fish passage barriers in anadromous waters associated with county roads. The project also included a reassessment and update of available county inventory data. The inventories and associated habitat surveys were conducted utilizing methods described in WDFW’s Fish Passage Barrier and Surface Water Diversion Screening Assessment and Prioritization Manual (WDFW 2009). This final report summarizes the results of the County Fish Passage Inventory work completed between July 1, 2013 and June 30, 2015. Detailed Fish Passage and Diversion Screening Inventory (FPDSI) database reports and Priority Index (PI) values will be provided directly to each county in Table 1.