Shellmouth Reservoir
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The Shellmouth Reservoir (also known as Lake of the Prairies) is a man-made reservoir on the Assiniboine River in Manitoba and Saskatchewan, Canada.[1]
The Shellmouth Dam (Template:Coord) is a multi-purpose embankment dam built by the Prairie Farm Rehabilitation Administration (PFRA).[1]
The dam and reservoir are part of a strategy to reduce the risk of flood damage for Winnipeg and other communities along the Assiniboine River.[1] For example, in the 1997 Red River flood, the inflow to the reservoir peaked at Template:Convert while the outflow never exceeded Template:Convert.[2] The reservoir is also used to supplement flows on the Assiniboine when conditions are dry, ensuring water supply for Brandon, Portage la Prairie, irrigators, and some industries. For example in early August, 2021 the flow in Brandon was a little over 9 m3/s while the outflow from Shellmouth was 5.7 m3/s and inflow was less than 0.5 m3/s. Therefore without the dam the flow in the Assiniboine at Brandon would be a bit under 4 m3/s.
Asessippi Provincial Park is established around the southern arm of the lake.
Specifications
The dam is Template:Convert high and Template:Convert long.[1]
The reservoir is Template:Convert in length and stores 390,000 acre feet (480 million cubic metres) at the spillway crest level of Template:Convert. Outflows are controlled by a gated conduit and a Template:Convert wide concrete chute spillway. The normal summer level target is between Template:Convert and Template:Convert.[1]
Fish species
Fish species include walleye, yellow perch, northern pike, mooneye, burbot, rock bass, brown bullhead, white sucker, shorthead redhorse and common carp. Rock bass are Saskatchewan's only native bass.
Gallery
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Shellmouth Dam sign
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Lake of the Prairies from the Shellmouth Dam
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Shellmouth Dam Control Structure
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Shellmouth Dam Spillway
See also
- List of lakes of Saskatchewan
- List of lakes of Manitoba
- Portage Diversion (Assiniboine River Floodway)
- Red River Floodway