Water structure Krpeľany was put into operation 5.12.1961 and is part of the so-called. Hornovážská cascade, which consists of 3 stages: Krpeľany – Sučany – Lipovec.
The purpose of the water construction is to use the energy of the river Vah to produce electricity. energy in the section between Kraľovany and Vrútky, local navigation and partial reduction of large water flows in the river Váh and the adjacent section by the capacity of the waterworks. For energy use is taken by water power plant Krpeľany max. 210 m3.s-1.
The Krpeľany stage consists of the following structures: earth dam, weir, power plant, reactive weir, small hydroelectric power plant, waste channel, treatment of the Váh in the reservoir and under the water works, 110 kV substation, pumping station Kraľovany. The dam, weir and power plant cross the valley of the Váh river, which gives way to water and creates a reservoir with a flooded area of 1.26 km2, the length of the backwater is 5990 m, max. the flood area is 510.0 m wide. Total tank volume (projected state) 8.333 mil. m3 is reduced to 3,500 mil.m3 due to sediment deposition (focus in 1977).