Dale Dike Reservoir or Dale Dyke Reservoir (grid reference SK240913) is a reservoir in the northeast Peak District, in South Yorkshire, England. It is situated a mile west of Bradfield (eight miles from Sheffield) on the Dale Dike, a stream which is one of the sources of the River Loxley. It was constructed between 1859 and 1864 by the Sheffield Waterworks Company to guarantee a supply of water to power the mills downstream and also to supply drinking water to the growing population of Sheffield, along with three others around the village of Bradfield: Agden Reservoir, Damflask Reservoir and Strines Reservoir.[1] In 1864 the newly built dam failed, causing the Great Sheffield Flood which caused massive damage downstream through Sheffield and hundreds of fatalities.[2] The dam was rebuilt in 1875 and is still in use, holding 446 million gallons of water which is now exclusively for drinking water.[3] It is owned by Yorkshire Water, part of the Kelda Group. The British national grid reference system is a system of geographic grid references commonly used in Great Britain, different from using latitude or longitude. ... The Peak District is an upland area in central and northern England, mainly spanning Derbyshire, but also covering bits of Cheshire, Staffordshire and South and West Yorkshire. ... South Yorkshire is a metropolitan and ceremonial county in the Yorkshire and the Humber Government Office Region of England, in the United Kingdom. ... Bradfield is a village in the borough of Sheffield, England and is situated in the Peak District. ... For other articles with similar names, see Sheffield (disambiguation). ... The River Loxley is a river in South Yorkshire, England. ... For other articles with similar names, see Sheffield (disambiguation). ... Agden reservoir showing the 30 metre high dam wall from above High Bradfield Agden Reservoir is a water storage reservoir, situated at grid reference SK260925, 10 kilometres west of the English city of Sheffield. ... Damflask Reservoir from Ughill Heights Damflask Reservoir is an English water feature situated at grid reference SK277907 five miles (eight kilometres) west of Sheffield in the Loxley valley close to the village of Low Bradfield. ... The Great Sheffield flood, also known as the Great Inundation, was a disaster that devastated parts of Sheffield, England on March 11, 1864. ... Kelda Group plc is a British utility company. ... Kelda Group plc (LSE: KEL) is a British utility company. ...