River Calder

The River Calder is a 13-mile long river that is one of the main tributaries of the River Wyre in Lancashire, England. 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".
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 before passing under the M6 motorway, West Coast Main Line and under the Calder Aqueduct on Lancaster Canal. 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.

Wikipedia