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The Jirkov water reservoir with a stony dam is located in a mountain valley near Jirkov. It was built between the years 1960-1960 on the Bílina River. The reservoir and its surroundings are inside a protective zone and therefore it is not freely accessible. The purpose of the reservoir is to provide potable water for the region of Chomutov, and further protect the region from floods and to ensure a minimum flow of water under the dam. There is also a small hydroelectric water power plant with a maximum aggregate output of 142.2 kW. The reservoir has a filled stony dam with a water-side clay seal. The dam crest is 454.80 m above sea level. Its length is 190 m and width 5.5 m. The maximum height of the dam above the terrain is 50.8 m. The reservoir capacity is 1.917 mil m3 and total water flowing area is 16.44 ha. Around the Jirkov reservoir there is a newly opened seasonal access road, connecting Jirkov and the Telšské valley. On a hill above the reservoir we can see the ruins of the former castle of Nanštejn.