Grassholme Reservoir is a large reservoir in County Durham, England. It is situated in Lunedale, which is a side valley of the River Tees, about 2 miles (3.2 km) south of Middleton-in-Teesdale. It supplies water for Teesdale and Teesside and is owned by Northumbrian Water. Its main recreational use is as an angling centre.

Grassholme Reservoir
Grassholme Reservoir seen from the Selset Reservoir outflow
Grassholme Reservoir is located in County Durham
Grassholme Reservoir
Grassholme Reservoir
LocationEngland
Coordinates54°35′46″N 2°5′46″W / 54.59611°N 2.09611°W / 54.59611; -2.09611
TypeReservoir
Primary inflowsRiver Lune
Primary outflowsRiver Lune
Managing agencyNorthumbrian Water
Surface elevation310 m (1,020 ft)

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