Bratsk Reservoir is a reservoir on the Angara River, located in the Lena-Angara Plateau of Irkutsk Oblast, Russia. It is named after the city of Bratsk, the largest city adjacent to the reservoir. It has a surface area of 5,470 square kilometres (2,110 sq mi) and a maximum volume of 169.27 × 1012 litres (37.2 × 1012 gallons).
The concrete dam of the Bratsk hydroelectric plant was completed in 1967. It is 125 metres (410 ft) high and 4,417 metres (14,491 ft) long. The Baikal Amur Mainline railroad runs along the top of the dam. At the time of its inauguration, the reservoir was the largest artificial lake dam in the world. Its electrical power capacity is 4,5 GW. To this day, it is classified as the second biggest dam in the world.
Bratsk Reservoir is multi-purpose, and used in an integrated way for hydropower, water transport, water supply, forestry, fisheries and recreation. There are 25 different kinds of fish in the reservoir, 10 are suitable for commercial purposes.
