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Lake Winnipegosis
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Lake Winnipeg map.png
Location Manitoba
Coordinates 52°30′N 100°00′W / 52.500°N 100.000°W / 52.500; -100.000
Lake type Glacial
Primary outflows Waterhen River
Catchment area 49,825 km2 (19,238 sq mi)
Basin countries Canada
Max. length 195 km (121 mi)
Max. width 51 km (32 mi)
Surface area 5,370 km2 (2,070 sq mi)
Max. depth 12 m (39 ft)
Surface elevation 254 m (833 ft)
Settlements Camperville, Winnipegosis

Lake Winnipegosis is a large (5,370 km²) lake in central North America, in Manitoba, Canada, some 300 km northwest of Winnipeg. It is Canada's eleventh-largest lake. An alternate spelling, once common but now rare, is Lake Winipigoos or simply 'Lake Winipigis'.

The lake's name derives from that of Lake Winnipeg, with a diminutive suffix. Winnipeg means 'big muddy waters' and Winnipegosis means 'little muddy waters'.

It appears as Winipgassish on the Fidler map of 1820, while modern spelling dates from as early as 1811.


NASA Lake Winnipeg
NASA image of Lake Winnipegosis
Lake Winnipegosis from Winnipegosis Beach

The elongated, 195 kilometre long lake is the second-largest of three large lakes in central Manitoba; the other two are Lake Winnipeg, the largest, and Lake Manitoba. All three lakes are on the floor of the prehistoric glacial Lake Agassiz (as are nearby Cedar Lake and the Lake of the Woods). The lake's watershed extends over some 49,825 km² in Manitoba and Saskatchewan. It receives most of its waters from the Manitoba Escarpment.

Lake Winnipegosis is separated from Cedar Lake by a 6 km (3.7 miles) wide (minimum width) land barrier at the north end and from Lake Manitoba by a 3 km (1.9 miles) wide (minimum width) land barrier at the southeast end at Meadow Portage.

Birch Island is the largest island on Lake Winnipegosis. The island, located near the middle of the lake, is part of Birch Island Provincial Park, created in 2010, and is adjacent to the Chitek Lake Park Reserve on the eastern shore.


The lake drains through the Waterhen River into Lake Manitoba, and is thus part of the Lake Winnipeg, Nelson River, and Hudson Bay watersheds. From Long Island Bay at the southeast end of the lake the West Waterhen and Little Waterhen rivers flow north about 16 km (10 miles) into Waterhen Lake then the Waterhen River flows south 22 km (13.5 miles) into Lake Manitoba.


Tributaries include the Mossy River (from Dauphin Lake), Point River, Pine River, North Duck River, Pelican River (from Pelican Lake), Shoal River (from Swan Lake), Steeprock River, Red Deer River and the Overflowing River.


The communities of Winnipegosis, Camperville, Pine Creek, Duck Bay, Salt Point and Meadow Portage are south of Birch Island while Shoal River, Pelican Rapids, Dawson Bay and Denbeigh Point are to the north of the island.


The lake supports a commercial fishery of walleye and other freshwater species. Northern pike and mullet together now account for over 80 percent of its commercial fishing.

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