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This is the largest and newest of the reservoirs in the Loxley River catchment area. It opened in 1897 for the Sheffield Corporation Waterworks; due to leakage problems it had been over 20 years in construction.
Unlike the higher reservoirs, Damflask was never intended for public water supply, instead being a compensation reservoir used to regulate water flow in the river for the benefit of the many industrial sites dependent on water power along the River Loxley. The two curving outlets at the foot of the dam are where the supply issues, controlled from the two pyramidal valve houses on the dam wall.
The dam itself is approximately 400 metres wide at the top, with a maximum height of 28 metres, and the reservoir has a capacity of nearly 5 million cubic metres of water. It now provides for sailing and fishing, and there is an easy-access circuit around the shore.
The name of the reservoir derives from the hamlet of Damflask. This was destroyed in the great flood of 1864 when the Dale Dyke Dam collapsed, and was never rebuilt because of the plans for the new Damflask Reservoir.