Kootenay Lake is a lake located in British Columbia, Canada. It is part of the Kootenay River. The lake has been raised by the Corra Linn Dam and has a dike system at the southern end, which, along with industry in the 1950s–70s, has changed the ecosystem in and around the water. The Kootenay Lake ferry is a year-round toll-free ferry that crosses between Kootenay Bay and Balfour. The lake is a popular summer tourist destination.[2]
Although oriented primarily in a north-south configuration, a western arm positioned roughly halfway up the length of the lake stretches 35 km to the City of Nelson.[5] The lake is 532m above sea level,[1] with the adjacent mountains rising up to a maximum of approximately 2700m.[3] The average residence for water in the lake is 1.5 years, although the west arm has a much faster rate of water replacement; about 3–4 days.[3]
Beach at Kokanee Creek Provincial ParkAerial view of the south end of Kootenay Lake, with Duck Lake
Kootenay Lake was formed through river erosion and, later, glaciation. The erosion began during the late Cretaceous until ice filled the resulting valley in the Pleistocene.[4] When the valley was filled with ice, glaciers from the mountains (the Selkirks and Purcells) fed the valley's ice mass. The glacier that occupied what is now the west arm of Kootenay Lake flowed into the Kootenay ice mass. As the ice melted from this glacier, drainage flowed over an area near what is now Nelson, causing the west arm of the lake to drain toward the west. A large moraine formed near what is now the large bend in the Kootenay River near Libby, Montana. As ice melted, a lake formed behind the moraine and drained southward over top of it. The southerly drainage over the moraine eventually stopped and the Kootenay River began to follow its present course.[4]
HistoryEdit
Kootenay Lake is part of the traditional territory of the Sinixt and Ktunaxa peoples.[6] These native populations used the lake and associated river systems as part of their seasonal migration and trading routes.[4]
In 1958 the Kootenay Lake Crossing, an electrical power line, was built, running across the north arm of Kootenay Lake. It was destroyed in 1962 by protestors and rebuilt later that year.[7]
The lake originally seasonally flooded an approximately 80 km long marsh lying to the lake's south within the Creston Valley. However, this has now been diked and converted to commercial agriculture. A smaller wetland area has been protected in this area.
In 1931, Corra Linn Dam was built at the outflow from Kootenay Lake, where it once again became a river.[8] The dam provides flood control and winter power generation by raising the normal water level by two meters. Just down river is Bonnington Falls, today the site of several hydroelectric dams. In 2003 the lake discharged 16.9 billion cubic metres of water. High water for that year was a normal 533 metres, the record is 537 metres in 1961.[9] In 1967 as part of the Columbia River Treaty the Duncan Dam was constructed above Kootenay Lake on the Duncan River, creating a 7,145 hectare reservoir for flow control.[10] Also part of the treaty Libby Dam in Montana was completed in 1975.
There was a large decrease in the numbers of Kokanee in the west arm of the lake in the late 1970s. The salmon fishery was closed in 1980 and remains closed as of 2011. The reason for the decline is not known; possibilities include reduced numbers of Mysis relicta (which had been introduced as a food source for the Kokanee in 1949)[10][11] into the west arm due to the increased control of water levels, the disruption of rearing habitat due to recurring drawdown of the lake, reduced productivity of benthos due to the reduction of the amount of nutrients into the lake (after the close of the fertilizer plant), overfishing in the 1960s to 1970s[4] or competition between the Mysis relicta and immature fish.[11] In 1990 the lake's southern Kokanee stocks neared extinction, and an experimental fertilizing program was started, with some success.[12][10]
Human use and impactEdit
SettlementsEdit
North arm of Kootenay Lake as seen from the village of Ainsworth around 1890.
Approximately 19,700 people live within 2.5 km (1.6 mi) of the Kootenay Lake shore; about 10,250 of those live in the City of Nelson.[3] The remaining are scattered among a number of small towns and villages:
In 1953 water quality in the lake was negatively affected when the Cominco phosphate fertilizer plant on the Kootenay River at Kimberley opened.[10] Large quantities of phosphorus entered the Kootenay River; the cause of cyanobacterial blooms from the 1950s until the early 1970s. This plant closed in 1973 eliminating these phosphates.[10] The construction of the Libby Dam on the Kootenai River in Montana and the Duncan Dam 1967 on the Duncan River, combined to further reduce natural phosphorus levels in the lake from the recorded highs.[4]
FerryEdit
One of the ferries operating on Kootenay Lake; The Osprey.
The lake is crossed by the Kootenay Lake ferry, a toll-free vehicular ferry operating between Balfour and Kootenay Bay. The ferry operates two boats in the summer and one during the winter.[13]
kootenay, lake, lake, located, british, columbia, canada, part, kootenay, river, lake, been, raised, corra, linn, dike, system, southern, which, along, with, industry, 1950s, changed, ecosystem, around, water, ferry, year, round, toll, free, ferry, that, cross. Kootenay Lake is a lake located in British Columbia Canada It is part of the Kootenay River The lake has been raised by the Corra Linn Dam and has a dike system at the southern end which along with industry in the 1950s 70s has changed the ecosystem in and around the water The Kootenay Lake ferry is a year round toll free ferry that crosses between Kootenay Bay and Balfour The lake is a popular summer tourist destination 2 Kootenay Lake 1 Map of Kootenay Lake British ColumbiaKootenay Lake 1 LocationKootenay region British ColumbiaCoordinates49 38 N 116 55 W 49 633 N 116 917 W 49 633 116 917Primary inflowsKootenay RiverPrimary outflowsKootenay RiverBasin countriesCanadaMax length104 km 65 mi Max width5 km 3 1 mi Average depthwest arm 10 m 33 ft main lake 45 m 148 ft Max depth150 m 490 ft Residence timeavg 1 5 yearsSurface elevation532 m 1 745 ft SettlementsNelson British Columbia Contents 1 Geography 2 History 3 Fauna 4 Human use and impact 4 1 Settlements 4 2 Upstream Influences 4 3 Ferry 5 See also 5 1 Steamboats 6 References 7 External linksGeography Edit nbsp Kootenay Lake with Old Tom Mountain in the background nbsp The Big Orange Bridge across Kootenay Lake West ArmKootenay Lake is a long narrow and deep fjord like lake located between the Selkirk and Purcell mountain ranges in the Kootenay region of British Columbia 3 4 It is one of the largest lakes in British Columbia at 104 km in length and 3 5 km in width 1 It is in part a widening of the Kootenay River which in turn drains into the Columbia River system at Castlegar British Columbia 1 Although oriented primarily in a north south configuration a western arm positioned roughly halfway up the length of the lake stretches 35 km to the City of Nelson 5 The lake is 532m above sea level 1 with the adjacent mountains rising up to a maximum of approximately 2700m 3 The average residence for water in the lake is 1 5 years although the west arm has a much faster rate of water replacement about 3 4 days 3 nbsp Beach at Kokanee Creek Provincial Park nbsp Aerial view of the south end of Kootenay Lake with Duck LakeKootenay Lake was formed through river erosion and later glaciation The erosion began during the late Cretaceous until ice filled the resulting valley in the Pleistocene 4 When the valley was filled with ice glaciers from the mountains the Selkirks and Purcells fed the valley s ice mass The glacier that occupied what is now the west arm of Kootenay Lake flowed into the Kootenay ice mass As the ice melted from this glacier drainage flowed over an area near what is now Nelson causing the west arm of the lake to drain toward the west A large moraine formed near what is now the large bend in the Kootenay River near Libby Montana As ice melted a lake formed behind the moraine and drained southward over top of it The southerly drainage over the moraine eventually stopped and the Kootenay River began to follow its present course 4 History EditKootenay Lake is part of the traditional territory of the Sinixt and Ktunaxa peoples 6 These native populations used the lake and associated river systems as part of their seasonal migration and trading routes 4 In 1958 the Kootenay Lake Crossing an electrical power line was built running across the north arm of Kootenay Lake It was destroyed in 1962 by protestors and rebuilt later that year 7 The lake originally seasonally flooded an approximately 80 km long marsh lying to the lake s south within the Creston Valley However this has now been diked and converted to commercial agriculture A smaller wetland area has been protected in this area In 1931 Corra Linn Dam was built at the outflow from Kootenay Lake where it once again became a river 8 The dam provides flood control and winter power generation by raising the normal water level by two meters Just down river is Bonnington Falls today the site of several hydroelectric dams In 2003 the lake discharged 16 9 billion cubic metres of water High water for that year was a normal 533 metres the record is 537 metres in 1961 9 In 1967 as part of the Columbia River Treaty the Duncan Dam was constructed above Kootenay Lake on the Duncan River creating a 7 145 hectare reservoir for flow control 10 Also part of the treaty Libby Dam in Montana was completed in 1975 Fauna EditKootenay Lake is populated with many species of fish such as Rainbow trout Bull Trout Burbot Mountain Whitefish White Sturgeon Brook Trout Largemouth Bass Yellow Perch Pumpkinseed sunfish and Kokanee Salmon 4 There was a large decrease in the numbers of Kokanee in the west arm of the lake in the late 1970s The salmon fishery was closed in 1980 and remains closed as of 2011 The reason for the decline is not known possibilities include reduced numbers of Mysis relicta which had been introduced as a food source for the Kokanee in 1949 10 11 into the west arm due to the increased control of water levels the disruption of rearing habitat due to recurring drawdown of the lake reduced productivity of benthos due to the reduction of the amount of nutrients into the lake after the close of the fertilizer plant overfishing in the 1960s to 1970s 4 or competition between the Mysis relicta and immature fish 11 In 1990 the lake s southern Kokanee stocks neared extinction and an experimental fertilizing program was started with some success 12 10 Human use and impact EditSettlements Edit nbsp North arm of Kootenay Lake as seen from the village of Ainsworth around 1890 Approximately 19 700 people live within 2 5 km 1 6 mi of the Kootenay Lake shore about 10 250 of those live in the City of Nelson 3 The remaining are scattered among a number of small towns and villages Kuskonook British Columbia Boswell British Columbia Crawford Bay British Columbia Ainsworth Hot Springs British Columbia Kaslo British Columbia Riondel British Columbia Balfour British Columbia Gray Creek British Columbia Kootenay Bay British Columbia Harrop British Columbia Procter British Columbia Sirdar British ColumbiaUpstream Influences Edit In 1953 water quality in the lake was negatively affected when the Cominco phosphate fertilizer plant on the Kootenay River at Kimberley opened 10 Large quantities of phosphorus entered the Kootenay River the cause of cyanobacterial blooms from the 1950s until the early 1970s This plant closed in 1973 eliminating these phosphates 10 The construction of the Libby Dam on the Kootenai River in Montana and the Duncan Dam 1967 on the Duncan River combined to further reduce natural phosphorus levels in the lake from the recorded highs 4 Ferry Edit nbsp One of the ferries operating on Kootenay Lake The Osprey The lake is crossed by the Kootenay Lake ferry a toll free vehicular ferry operating between Balfour and Kootenay Bay The ferry operates two boats in the summer and one during the winter 13 See also Edit nbsp Canada portalDuncan River British Columbia Glass House British Columbia Steamboats Edit City of Ainsworth MoyieReferences Edit a b c d Balance of Power Hydroelectric Development in Southeastern BC Kootenay Lake Virtual Museum Archived from the original on June 29 2011 Retrieved February 15 2011 International Lake Environment Committee Promoting Sustainable Management of the World s Lakes and Reservoirs KOOTENAY LAKE February 15 2011 Wldb ilec or jp Archived from the original on March 18 2012 Retrieved 2013 05 02 a b c d Kootenay Lake Retrieved February 15 2011 a b c d e f g International Lake Environment Committee Promoting Sustainable Management of the World s Lakes and Reservoirs KOOTENAY LAKE Retrieved February 15 2011 Kootenay Lake British Columbia Canada Britishcolumbia com Archived from the original on 2013 01 29 Retrieved 2013 05 02 Vancouver Island Kootenay Lake Kootenays BC Retrieved February 15 2011 Vancouverisland com Archived from the original on July 14 2014 Retrieved 2013 05 02 Fortis BC Retrieved February 15 2011 Archived December 24 2010 at the Wayback Machine BC geographical names Corra Linn Dam Retrieved February 15 2011 Home International Joint Commission PDF a b c d e Fish and Wildlife Compensation Program Background and History Retrieved February 15 2011 a b Fly Fish BC Kootenay Lake Karma Retrieved February 15 2011 Royal BC Museum Retrieved February 15 2011 Ministry of Transportation Inland Ferry Schedules Kootenay Lake Ferry Retrieved February 15 2011 Th gov bc ca 2013 04 23 Archived from the original on 2008 12 16 Retrieved 2013 05 02 External links Edit nbsp Wikimedia Commons has media related to Kootenay Lake Official website More on Kootenay Lake Archived 2013 01 29 at the Wayback Machine Retrieved from https en wikipedia org w index php title Kootenay Lake amp oldid 1155955637, wikipedia, wiki, book, books, library,
