Glörtalsperre, Reservoir in Breckerfeld, Germany.

The Glörtalsperre is a reservoir on the border of the Ennepe-Ruhr and Märkischer districts, its water shared roughly equally by Breckerfeld, Schalksmühle and Halver. It is held back by a curved gravity dam of quarry-stone masonry, 168 m long and 32 m high, impounding the Glör. The 21-hectare lake is ringed by forest, with a small red-roofed building at the shore and thin wooden structures reaching into the water.

The Glörtalsperre was built in 1903/04 for the Volmetalsperren-Genossenschaft, to designs by Professor Otto Intze of Aachen, and began operating on 17 November 1904; it was formally inaugurated on 11 June 1906. It supplied process water to water-powered works in the Glör and lower Volme valleys and raised the Ruhr in times of low water. In 1997 closure threatened, but the reservoir's recreational value saved it; the Ruhrverband took over technical management of the dam in July 2018.

The Glör is dammed near the villages of Glörfeld, Loh, Reeswinkel and Rotthausen. Since shortly after the Second World War, an open-air forest service has been held every Whit Monday, and the reservoir is also a well-known meeting point for motorcyclists.

A 3.4 km circular trail runs around the reservoir and is suitable for wheelchair users and pushchairs. A large car park, a restaurant and the Breckerfeld youth hostel stand close to the shore. The water is fully drained during major inspections, as in 2017-2018 and 2000-2003.

The reservoir is a spawning ground for minnows: in spring, shoals of these small fish swim up the Glörbach, the males coloured red, green and blue. After the tadpole stage, young grass frogs leave the water in high summer, especially in the Rothauser Bucht, sometimes in masses just before thunderstorms.