River Don, South Yorkshire - Course

Course

The river Don rises in the Peak District, on Great Grains Moss, a millstone grit moorland area between 1,480 and 1,570 feet (450 and 480 m) above sea level. A series of small streams, including Great Grains and Black Grough join up, and within 1.2 miles (1.9 km) enter Winscar Reservoir. Reaps Dyke rises within 500 yards (460 m) of the source, and flows in a semicircle to the north, through Snailsden reservoir and Harden reservoir, to flow into another arm of Winscar reservoir. Just 100 yards (91 m) from the source, Withens Brook rises, but flows westwards, to supply the reservoirs of Longdendale and the people of Manchester. To the south of Winscar reservoir, other streams supply Upper Windleden and Lower Windleden reservoirs.

All of these reservoirs were built in the late 19th century for the Dewsbury and Heckmondwike Waterworks Board. Lower Windleden was the first to be completed in 1872, with Upper Windleden following in 1890. Winscar, Snailsden and Harden were all completed in 1899, although Winscar was called Dunford Bridge at the time. A new dam was built at Winscar between 1972 and 1975, and replaced the earlier earth dam. In order to fit it in, without destroying the village of Dunford Bridge, the dam is built of rock fill, which allows the faces to be much steeper than those of an earth dam, and the inner face is covered with two layers of asphaltic concrete, the first such use of this material on a dam in Britain. The dam is 174 feet (53 m) high and contains around 1,180,000 cubic yards (900,000 m3) of rock fill. Another innovation in its construction was the use of a hydraulic jump pool at the foot of the overflow chute, which dissipates the energy of the cascading water. The reservoir supplies drinking water to the Calder Valley, some 12 miles (19 km) to the north, and is also the base for Pennine Sailing Club, who offer basic training in sailing skills, on courses certified by the Royal Yachting Association.

The Don flows from the foot of Winscar Dam, close to the eastern portal of the Woodhead Tunnel, through the Hamlet of Dunford Bridge, and continues, first east and then south east, on its way to Sheffield. Near Penistone, the river is joined by Scout Dike, which flows from the Ingbirchworth, Royd Moor and Scout Dike reservoirs. The Little Don River or River Porter, on which there are three more reservoirs, joins the Don near Deepcar, while at Wharncliffe Side, the Ewden Beck joins, after flowing through Broomhead and More Hall reservoirs. By the time it reaches Oughtibridge, the river is below the 300-foot (91 m) contour.