Keywords: FMIB 35214 Outline Plan Showing Location of Fishway at Canal Dam No4, Potomac River.jpeg check categories 15 August 2015 3 Outline Plan Showing Location of Fishway at Canal Dam No 4 Potomac River Subject Fishways Geographic Subject United States--Potomac River Tag Dams 1884 Cite book New System of Fishway-Building McDonald Marshall Washington DC Government Printing Office 1884 Report of the Commissioner for 1882 United Sates Commission of Fish and Fisheries Plate VII Creator Marshall McDonald PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 35214 Images from the Freshwater and Marine Image Bank to check Marshall McDonald Fish ladders Potomac River |