Greenfield reservoir is the smallest of the four reservoirs in the Dovestone region. It is situated above Yeoman Hey reservoir and is the quietest as far as visitor pressure goes. A railway that ferried materials used to run alongside the reservoir of its western flanks and travelled all the way to the confluences of Holme Clough and Birchen Clough where there is a tunnel through the hillside. Little remains of the railway (unlike much information about the Chew Valley Tramway) apart from a few signs of its existence.
Greenfield reservoir constructed between 1897 – 1902.
Capacity 102 million gallons (464 million litres) Maximum depth 62 feet (20 metres)