Cow Green Reservoir

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Cow Green Reservoir
Cow Green Dam.jpg
The Dam at Cow Green
Location County Durham/Cumbria border
Coordinates 54°40′5″N 2°18′30″W / 54.66806°N 2.30833°W / 54.66806; -2.30833Coordinates: 54°40′5″N 2°18′30″W / 54.66806°N 2.30833°W / 54.66806; -2.30833
Type reservoir
Basin countries United Kingdom
Max. length 2 mi (3 km)

Cow Green Reservoir, is a water reservoir 2 miles (3 km) long built between 1967 and 1971 to supply the industries of Teesside in England.[1]

The reservoir acts as a river regulation reservoir releasing water into the River Tees during dry conditions so that it can be abstracted further downstream. These regulated flows allow six further reservoir levels to be maintained and these in turn provide water for industry and domestic use.[2]

Cow Green Reservoir, with (l to r) Great Dun Fell, Little Dun Fell and Cross Fell in the background at a distance of about 10km

Environmentally, this part of Upper Teesdale is of national importance and the plan to construct this reservoir had been strongly opposed by local conservationists. Their main concern was the protection of the rich flora and fauna of the district and especially rare alpine plants like the unique Teesdale violet. In the end, about a tenth of this plant's habitat was destroyed by the completion of the reservoir. The remaining area was designated the Moor House-Upper Teesdale National Nature Reserve in 1969, from what was previously two separate nature reserves and is England's largest terrestrial such reserve.

The reservoir lies within the North Pennines Area of Outstanding Natural Beauty and European Geopark. The North Pennines was designated as an AONB in 1988 and became Britain's first European Geopark in 2004.

A short distance downstream from the dam is Cauldron Snout waterfall.

Cow Green Reservoir is also the largest reserve of wild brown trout in the North East.

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