|Location||Baranof Island, Sitka City and Borough, Alaska, US|
|Type||Glacial lake, Meromictic|
|Primary outflows||Redoubt falls|
|Basin countries||United States|
|Max. length||9 mi (14 km)|
|Max. width||1 mi (1.6 km)|
|Surface area||3,200 acres (13 km2)|
|Average depth||460 ft (140 m)|
|Max. depth||870 ft (270 m)|
|Surface elevation||15 ft (4.6 m)|
Redoubt Lake, or Kunaa Shak Áayi, is a long, narrow lake on Baranof Island, near Sitka, Alaska. It is located in a glacially-carved valley in Tongass National Forest. It was named Ozero Glubokoye, meaning "deep lake", in 1809 by the Russian navigator Ivan Vasilyev.
Redoubt Lake is one of the largest meromictic lakes in North America. Its water is fresh to a depth of 330 ft (100 m), below which is a dense, saltwater layer. The lake's maximum depth is 870 ft (270 m) with a mean depth of 460 ft (140 m). Its surface area covers 3,200 acres (13 km2).
In the early 19th century Redoubt Lake was part of Russian America. The Russians established a small settlement near the lake's outlet known variously as Ozersk Redoubt, Ozyorsk Redoubt, The Redoubt, Seleniye Dranishnikova, or Dranishnikov Settlement. Salmon traps were set in the lake and the catch was salted and dried at Ozersk Redoubt. Between 1817 and 1832 the Russians at Sitka and Ozersk Redoubt salted an average of 20,000 salmon annually.
Fish harvests by the Russians at Redoubt Lake sometimes exceeded 50,000 sockeye salmon per year. Annual escapements possibly exceeded 100,000 sockeye. In the 1980s, sockeye escapement or returns of adult fish had declined to an average less than 10,000 annually. Some years the numbers measured in the low hundreds.
- "Lake Water Quality Records and Lake Levels - Southeast Alaska" (PDF). USGS. December 18, 2002. p. 1. Retrieved 2007-05-27.
- Joseph, Charlie; Brady, I.; Makinen, E.; David, R.; Davis, V.; Johnson, A.; Lord, N. (2001). "Sheet’kwaan Aani Aya". Sitka Tribe of Alaska. Retrieved 27 October 2009.
- U.S. Geological Survey Geographic Names Information System: Redoubt Lake
- Redoubt Lake Sockeye Salmon Enhancement and Monitoring, Tongass National Forest, US Forest Service
- Gibson, James R. (1997). The Lifeline of the Oregon Country: The Fraser-Columbia Brigade System, 1811-47. University of British Columbia (UBC) Press. ISBN 0-7748-0643-5.
- U.S. Geological Survey Geographic Names Information System: The Redoubt (historical)
- The fishermen's frontier: people and salmon in Southeast Alaska, by David F. Arnold, William Cronon
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