The idea of construction of a dam on the Dunajec river in Rożnow was born after the disastrous 1934 flood in Poland . Due to lack of funds , the project was postponed until 1937 , when first land purchases were made . The dam was built by a Polish-French company , which constructed a special settlement for the workers and engineers ( the so-called French Colony ) , together with narrow gauge rail line to a stone quarry at Marcinkowice . Construction was interrupted after the Invasion of Poland , but as early as November 1939 , German authorities of the General Government decided to continue it , using Polish plans . The dam together with the power plant was completed in 1942 . It is built from concrete , with the height of 44 meters , and the length of 550 meters
1934 flood in Poland
1934 flood in Poland
Lake Rożnów