Toddbrook Reservoir was built in 1831 as a feeder for the Peak Forest Canal. It is sited above the town of Whaley Bridge in the High Peak, Derbyshire. The reservoir is a Site of Special Scientific Interest . It provides habitat for herons, ducks and other animals and fish. Also rare mosses and liverworts grow on its shores, particularly short-lived species that grow on seasonally exposed mud. The reservoir is also used for sailing and angling. It hosts many sailing events including DYS (Derbyshire Youth Sailing). The reservoir is owned by the Canal & River Trust and, like Combs Reservoir, is a feeder reservoir for Peak Forest Canal. The feeder runs though Whaley Bridge, and (along with the Combs feed) enters the canal system in a pool close to the transhipments shed at the Whaley Bridge Canal Basin.
The reservoir is fed from a stream named Todd Brook, which has a large catchment area including the shining tor moor land above the reservoir, through which the brook flows. Water enters the reservoir on its north bank through a small waterfall. The first several inches of this do not flow into the reservoir and continue flowing down the reservoir's run off and into the River Goyt. This means that the reservoir often receives little or no inflow during periods where rainfall does not allow the level to exceed this barrier. This often has significant impact on the reservoir's water level, particularly in the summer months.