Beaver Dyke Reservoirs were two water supply reservoirs (one of which is still extant), west of

Harrogate Harrogate ( ) is a spa town and the administrative centre of the Borough of Harrogate in North Yorkshire, England. Historically in the West Riding of Yorkshire, the town is a tourist destination and its visitor attractions include its spa w ...

North Yorkshire North Yorkshire is the largest ceremonial counties of England, ceremonial county (lieutenancy area) in England, covering an area of . Around 40% of the county is covered by National parks of the United Kingdom, national parks, including most of ...

, England. The main reservoir, also known as Lower Beaver Dyke Reservoir, was constructed in 1890 and had a surface area of 9 ha. In 2008 the reservoir's owner,

Yorkshire Water Yorkshire Water is a water supply and treatment utility company servicing West Yorkshire, South Yorkshire, the East Riding of Yorkshire, part of North Lincolnshire, most of North Yorkshire and part of Derbyshire, in England. The company has its ...

, decided that it was not economic to maintain its ageing structures. It was decommissioned between 2013 and 2015 by breaching its dam and channelling a stream in the bed of the former reservoir. A residual lake of 0.5 ha was retained. The water of the reservoir was relatively nutrient rich, but it was known to suffer from potentially toxic blooms of

Blue green algae Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, blue ...

. The smaller reservoir (also called John O'Gaunts Reservoir due to the proximity of John O'Gaunt's Castle) is still filled with water.

References

Reservoirs in North Yorkshire Geography of Harrogate Former drinking water reservoirs in England {{Watersupply-stub