Fewston Reservoir is located in the Washburn valley north of Otley and west of Harrogate in Yorkshire, England. It was built in 1879. The capacity is about 3.5 million cubic metres. It can be found from the A59 road.The overflow from the reservoir feeds directly into the adjoining Swinsty Reservoir. Formerly, this overflow was encircled by a metal walkway from which floodboards could be lowered, but this has since been removed.