Beaver Dyke Reservoirs are two water supply reservoirs near to Harrogate, North Yorkshire, England. The main reservoir was constructed in 1890 and has a surface area of 9 Ha. The water is relatively nutrient rich, but it has been known to suffer from potentially toxic blooms of Blue green algae.
Coordinates: 53°59′11″N 1°39′41″W / 53.9864°N 1.6614°W
As of 2013 the main Beaver Dyke Reservoir is being decommissioned. The smaller reservoir (also called John O'Gaunts due to the proximity of John O'Gaunt's Castle) is still filled with water.