River Nidd

The River Nidd is a tributary of the River Ouse in the English county of North Yorkshire. In its first few miles it is dammed three times to create Angram Reservoir, Scar House Reservoir and Gouthwaite Reservoir, which attract a total of around 150,000 visitors a year. The Nidd can overflow the reservoirs, flooding the caves in the valley. In such cases the river overflows into the normally dry river bed past Lofthouse through to Gouthwaite Reservoir. The Yorkshire Dales Rivers Trust YDRT has a remit to conserve the ecological condition of the River Nidd from its headwaters to the Humber estuary.

River Nidd
Railway Viaduct over the River Nidd in Knaresborough
54°10′23″N 1°59′53″W
EtymologyProbably a Celtic word meaning "bright, brilliant, shining"
Location
CountryEngland
Physical characteristics
Source 
 • locationNidd Head Spring, 1.3 km north of the summit of Great Whernside
 • elevation595 metres (1,952 ft)
Mouth 
 • location
River Ouse, Nun Monkton
 • coordinates
54°0′51″N 1°13′8″W
 • elevation
13 metres (43 ft)
Length94.45 kilometres (58.69 mi)
Basin size516 square kilometres (199 sq mi)
Basin features
River systemSwale–Ouse

The upper river valley, Nidderdale, was designated as an Area of Outstanding Natural Beauty in 1994.

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