Steinbachtalsperre
An aerial photo of the dam, 2015
Location of Steinbachtalsperre in North Rhine-Westphalia
Country	Germany
Location	Euskirchen, North Rhine-Westphalia
Coordinates	50°35′27″N 6°50′12″E / 50.590833°N 6.836667°E / 50.590833; 6.836667
Status	In use
Construction began	1934
Dam and spillways
Height (foundation)	23m
Length	240m
Width (crest)	≈ 5m
Dam volume	100,000 m3
Reservoir
Total capacity	1.2 million metres3
Active capacity	1.06 million metres3
Catchment area	16 km2
Surface area	14.6 hectares
Maximum length	980m
Maximum width	380m
Normal elevation	278.73 m

The Steinbachtal Dam (German: Steinbachtalsperre) is a dam in the city of Euskirchen, North Rhine-Westphalia south of Euskirchen-Kirchheim [de].

The dam was built due to pressure from the Euskirchen cloth industry, who by the late 1920s was no longer able to meet its water needs from the natural streams in the area. Problems included the water quality, which was heavily polluted by waste from the Mechernich lead mining industry. Additionally, the amount of water available was no longer sufficient to drive the turbines for hydroelectric power.^[1] The Steinbach Reservoir Association (German: Zweckverband Steinbachtalsperre) was founded in 1933 to carry out the construction and ongoing operation of the dam. Construction work began in February 1934 and finished in 1936. A 16 km cast-iron pipeline, was built to transport the water to the town of Euskirchen and Kuchenheim.

The lake, which has a maximum depth of 17.4m, is now a popular local recreation area. The dam structure of the reservoir was made of coarse-stone with a clay seal on the water side. It is operated by the Zweckverband Steinbachtalsperre/Wasserversorgungsverband Euskirchen-Swisttal.^[2]

From September 1988 to 1990, the dam was redeveloped. Recommissioning began on 27 April 1990.^[3] The water side was equipped with a 0.80 m thick concrete layer and two asphalt layers.

During the continuous rain in mid-July 2021 the spillways capacity was to small and the earthen dam over-topped for around three hours. Large parts of the air side washed away and the dam was in danger of bursting due to the heavy load. Therefore, about 15,000 residents of the villages Schweinheim [de], Flamersheim [de], Palmersheim [de] several villages in Swisttal and the Rheinbach districts Niederdrees and Oberdrees located below had to be evacuated.^[4][5] Potential evacuations were announced for other regions along the Erft, especially Erftstadt and Kerpen. The stones washed away from the dam settled below the bottom outlet and blocked it.

The situation calmed down after the blockage was able to be resolved and a controlled outflow was made possible; additionally several units of the fire brigade and the Federal Agency for Technical Relief (THW) pumped out water.^[6]

Evacuation was lifted after five days when the reservoir was nearly empty.

• List of dams and reservoirs in Germany

• Andreas Dix: Industrialisierung und Wassernutzung. Eine historisch-geographische Umweltgeschichte der Tuchfabrik Ludwig Müller in Kuchenheim (= Beiträge zur Industrie- und Sozialgeschichte. Bd. 7). Rheinland-Verlag GmbH, Köln 1997, ISBN 3-7927-1600-3 (Zugleich: Bonn, Univ., Diss., 1993).
• Gundula Lang (2008), "Das Nützliche mit dem Schönen verbinden: Das Waldschwimmbad an der Steinbachtalsperre bei Euskirchen-Kirchheim" (PDF), Denkmalpflege Im Rheinland (in German), vol. 25, no. 3, pp. 134–140, ISSN 0177-2619, retrieved 8 November 2008, Format: PDF, KBytes: 871

• 
  View of the dam in northeastern direction.
• 
  Information board at the dam
• 
  Forest restaurant at the dam
• 
  Evening atmosphere at the Steinbach dam
• 
  Aerial view, 2015

Wikimedia Commons has media related to Steinbachtalsperre (NRW).

• List of dams in NRW (PDF; 122 kB)
• History of the dam