River Calder, Lancashire

River Calder
The River Calder at Altham
Location
CountryEngland
Physical characteristics
Source 
 • locationCalderhead, Cliviger, Lancashire
 • elevation758 ft (231 m)
Mouth 
 • location
River Ribble near Brockhall Village
 • elevation
100 ft (30 m)
Length20 mi (32 km)

The River Calder is a major tributary of the River Ribble in Lancashire, England, and is around 20 miles (32 km) in length.