 Construction of the three-step industrial dam at the critical point where the two rivers (Izh and Yagul/Podborenka) join started both the pond and the city in April 1760.The dam was reconstructed in 1809–1815 when Andrey Fedorovich Deryabin converted the original metalworking factory into the new arms producing facility.It was subsequently modernized again in 1983–1984 in order to extend the dam.