Green Lake is a lake/reservoir south of Sitka, Alaska. It is fed by the Vodopad River and outflows into Silver Bay. The Medvejie Fish Hatchery short-term rears smolt in net pens in Green Lake. The lake is artificially expanded by the Green Lake Dam. The rock-fill embankment dam is 1,130 feet long. Annually Green Lake Dam generates about 60 gigawatt ho…Green Lake is a lake/reservoir south of Sitka, Alaska. It is fed by the Vodopad River and outflows into Silver Bay. The Medvejie Fish Hatchery short-term rears smolt in net pens in Green Lake. The lake is artificially expanded by the Green Lake Dam. The rock-fill embankment dam is 1,130 feet long. Annually Green Lake Dam generates about 60 gigawatt hours of electricity. Green Lake Dam works in tandem with the Blue Lake Dam to provide hydropower to Sitka.