The history of the Orava water construction dates back to the beginning of the 19th century, when the first designs for the construction of the dam in Ústianské hrdlo were worked out. The first such designs are from 1830 and therefore more than 100 years before the construction of the Orava Water Construction. All proposals were aimed at eliminating or at least mitigating the consequences of the devastating floods that have been very common in the past.
The construction of the system of water works on the river Orava, between the villages of Tvrdošín and Ústí nad Oravou is formed by the Orava Water Structure, which took place during World War II, from 1941 to 1953. parameters and technological equipment of hydropower plant. All deficiencies that arose during construction were removed after the end of the war in 1949 by creating a concrete gravity dam. Slanica, Usti, Lavkov, Hamre and Osada were flooded in the reservoirs and two villages were partially flooded, with the need to relocate about 3200 inhabitants.
The realization of the water structure Tvrdošín, which is a buffer tank of the top power plant Orava, took place in 1972 – 1978.
The purpose of the Orava water structure, which is located below the confluence of the White and Black Orava, is to improve the low flow rates of Orava and Váh for energy use, for industry, agriculture, sports, recreation and fishing.
The total volume of the Orava reservoir is an impressive 536,176 mil. m3.
The water work is administered by the Slovak State Water Management Company.


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