- location: Scammonden
- status: still exists
- category: reservoir
Following the passing of the Huddersfield Corporation Act of 1965, the reservoir was constructed as a joint project between the Ministry of Transport and Huddersfield Corporation at a cost of £11,000,000, with the embankment forming part of the new M62 motorway.
The reservoir was officially opened by Queen Elizabeth II on Thursday 14 October 1971.
The flooded valley was once the home to several mills:
- Upper Mill — a fulling mill in the mid-1800s
- Middle Mill — a fulling mill in the mid-1800s but disused by the 1890s
- Old House Mill — a woollen mill in the mid-1800s but disused by the 1890s
It is sometimes claimed that a village was submerged, but the immediate area primarily comprised scattered and isolated farmhouses.