The River Calder is a 13-mile (21 km) long river that is one of the main tributaries of the River Wyre in Lancashire, England.[1] Like the other rivers in England with the name Calder, its name is thought to derive from a mixture of Old Welsh and Old British words meaning "hard and violent water or stream".[2]
Just west of the M6 Motorway, a feeder section supplies water via a siphon from the River Calder to the Lancaster canal; this intake has the ability to abstract the entire flow of water from the River Calder causing critical flow conditions further west of this point to its mouth with the River Wyre.[6] Similarly, Barnacre and Grizedale Lea Reservoirs, which built in the 1800s just west of Oakenclough, can take all the flow from the upper reaches of the River Calder with no compensation during periods of low flow.[7]
The Calder is one of two rivers in Lancashire with the same name; the other River Calder flows from Burnley and into the River Ribble.
Mill Pond Weir St Johns Wood Calder Vale after Snowfall
Weir and Path Above Calder Vale
Calder Intake
River Calder going under the Calder Aqueduct
River Calder looking downstream from the Calder Aqueduct
References
^"Calder (Wyre)". environment.data.gov.uk. Retrieved 15 September 2017.
^Ekwall, Eilert (1960). The concise Oxford dictionary of English place-names (4 ed.). Oxford: Clarendon Press. p. 82. ISBN0-19-869103-3.
^Baines, Thomas (2012). Lancashire and Cheshire : past and present : a comprehensive history of Cheshire, Lancashire, Manchester and Merseyside. [England]: Heritage Publications. p. 90. ISBN978-1-4710-7838-5.
^Fisher, Stuart (2015). "43: Lancaster Canal". The Canal Guide; Britain's 50 Best Canals. London: Bloomsbury. p. 298. ISBN978-1-4729-1852-9.