The Souris River is the primary tributary contributing flow to the Assiniboine in this reach.
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Tributaries include the Whitesand River which joins it near Kamsack, Saskatchewan, the Souris River which joins it near Wawanesa, the Birdtail River which joins at the Birdtail Sioux First Nation, the Little Saskatchewan which joins west of Brandon and the Qu'Appelle River which joins near the site of historic Fort Ellice.
Gainsborough Creek is a tributary of the Souris River in southeastern Saskatchewan and southwestern Manitoba.
MHS also includes two alternative campuses: Souris River Campus (for students age 16 and over) and Central Campus East (for students under 16).
Mississippi River | River Thames | Amazon River | Columbia River | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | River Tees | Fraser River | Yangtze River | Tocantins River |
In early May, flash flooding occurred between the Souris River source and the Assiniboine River, as Kingsley No. 124, Saskatchewan saw its worst flooding in over 50 years.