Grassholme Reservoir, lake in the United Kingdom
Grassholme Reservoir is a large water storage facility in Lunedale valley in County Durham, located about two miles south of Middleton-in-Teesdale. The water comes mainly from the River Lune and flows back into it, while the shoreline is lined with reeds and vegetation spreading along the surrounding slopes.
The structure was completed in 1915 as part of a network of water storage facilities for regional industry. The dam was designed by James Mansergh and built from earth, requiring the flooding of existing fields and at least eight farms to make space for the water.
The reservoir is a place where visitors connect with nature through fishing, birdwatching, and walking the surrounding moorlands. The water's edge and landscape support local wildlife that people come to observe and appreciate during their visits.
Access is via the B6277 road from Middleton-in-Teesdale, with pay-and-display parking near the dam and a walking loop of about four miles around the water. Visitors will find restrooms, a visitor center, a fishing supply shop, and picnic areas, though swimming and boating are not permitted.
The dam was designed by James Mansergh and features special spillways that safely divert excess water during heavy rainfall. This construction is an example of early engineering and shows how water is carefully managed to support river flow throughout the year.
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