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]

River Calder
The River Calder, near its source
Physical characteristics
Source	Fiendsdale Head
• location	Forest of Bowland, Lancashire
• coordinates	53°55′50.6″N 2°38′14.4″W
• elevation	1,440 feet (440 m)
Mouth	Barnacre-with-Bonds
• location	Catterall
• coordinates	53°52′55.1″N 2°46′28.8″W
• elevation	43 feet (13 m)
Length	13 miles (21 km)
Basin size	11 square miles (28 km2)

v t e River Calder, Wyre
Legend
Source North Grain East Grain Calder Dyke Oakenclough Mill Nanny Brook Mill Sandholme Bridge Sandholme Mill M6 Motorway West Coast Main Line Canal feeder Lancaster Canal B6430 Garstang Road River Wyre River Wyre

Description

The river rises near Fiendsdale Head in the Forest of Bowland and flows first westwards then southwards through the villages of Oakenclough and Calder Vale[3] before passing under the M6 motorway, West Coast Main Line and under the Calder Aqueduct on Lancaster Canal.[4] It meets the Wyre at Catterall near the town of Garstang, at which point the Calder forms the boundary between the parishes of Catterall and Barnacre-with-Bonds.[5]

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. 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]

Settlements

• Oakenclough
• Calder Vale
• Catterall

Tributaries

• Little Calder River
• Nanny Brook
• Calder Dyke
• East Grain
• North Grain

Gallery

• 
  The River Calder in its upper reaches
• 
  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

Sources

• Wyre Consultation Report (PDF) (Report). Warrington: Environment Agency (North West Region). April 1997.

External links

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[de] River Calder (Wyre)