The River Caldew is a river running through Cumbria in England. Historically, the county watered by the Caldew was Cumberland. The Caldew's source is high up on Skiddaw, between the summit and Sale How, in the Lake District, from where it runs east through a valley between Bowscale Fell and Carrock Fell. In 2016 the floodwaters of the swollen river Caldew washed away the eighteenth-century Bell Bridge at Sebergham.