Souris River

Souris River
Mouse River, *Rivière Souris*
Souris River; Mouse River, Rivière Souris
	The river in the town of Souris, Manitoba
	The Red River drainage basin,; with the Souris River highlighted
Location
Countries	Canada; United States;
Provinces	Manitoba; Saskatchewan;
State	North Dakota
Cities	Minot, ND; Souris, MB; ; Weyburn, SK; Melita, MB;
Physical characteristics
Source	north of Weyburn
• location	Saskatchewan
• coordinates	49°49′53″N 103°47′46″W / 49.83139°N 103.79611°W
Mouth	Assiniboine River
• location	Manitoba, Canada
• coordinates	49°39′54″N 99°34′07″W / 49.66500°N 99.56861°W
Length	700 km (430 mi)
Basin size	61,000 km2 (24,000 sq mi)
Discharge
• location	Weyburn, SK; river mile 97.9 (river kilometre 157.6)
Basin features
River system	Red River drainage basin
Tributaries
• left	Antler
• right	Gainsborough

The Souris River (/ˈsʊərɪs/; French: rivière Souris) or Mouse River (as it is alternatively known in the U.S., a translation of its French name) is a river in central North America. Approximately 700 kilometres (400 mi) in length, it drains about 61,100 square kilometres (23,600 sq mi) in Canada and the United States.

Rising in southern Saskatchewan in the Yellow Grass Marshes north of Weyburn, the river wanders southeast into the U.S. through North Dakota beyond Minot to its most southern point at Velva, and then back north into Canada in southwestern Manitoba.

Flowing east, it passes through the communities of Melita, Hartney, Souris, and Wawanesa, Manitoba, prior to the confluence with the Assiniboine River near Treesbank, about 40 kilometres (25 mi) southeast of Brandon. The main tributaries of the Souris in Manitoba are the Antler River, Gainsborough Creek, and Plum Creek. The elevation at the confluence is approximately 340 metres (1,120 ft) above sea level.

At the end of the last ice age, over 10,000 years ago, the rapid draining of former Glacial Lake Regina eroded a large channel that is now occupied by the much smaller contemporary Souris River.^[3] Also, much of the drainage basin is fertile silt and clay deposited by another former glacial lake, Lake Souris.

Flow rates and flood potential

During the period from 1930 to 1941 severe drought conditions prevailed and PFRA constructed four stock watering dams. In 1937 the Snyder and Ross Dams were built near Melita. In 1938 the Napinka Dam was built and the Hartney Dam was built in 1941. These were all stop log dams with a total capacity of 2,400 acre-feet (3,000,000 m³). The Souris Dam was originally built in 1911 and was rebuilt in 1935. The Wawanesa Dam was completed in 1951 storing about 320 acre-feet (390,000 m³) of water.

Most of the annual flow of the Souris River comes from snow melt and spring rains. The annual flow volume varies dramatically from 3,400 acre-feet (4,200,000 m³) in 1937 to 2,100,000 acre-feet (2.6 km³) in 1976. It is expected that the total runoff for 2011 at Wawanesa will exceed 3,800,000 acre-feet (4.7 km³) about a one in 500-year event. The average annual runoff is equivalent to 3 mm over the entire Souris River watershed.^[4]

Two large dams in Saskatchewan, Rafferty Dam and Grant Devine Dam were built, in part, to reduce flood peaks on the Souris River.

In summer 2011, a historic flood affected much of the Souris River basin, overtopping levees and causing the evacuation of about 11,000 residents in Minot as well as significant damage to farmland and other property along the length of the river.

The channel capacity of the river in Manitoba varies from about 150 cubic feet per second (4.2 m³/s) near the border, to about 1,400 cu ft/s (40 m³/s) through Melita, to about 1,100 cu ft/s (31 m³/s) near Lauder and 1,700 cu ft/s (48 m³/s) near Hartney. North of Hartney the capacity increases to more than 3,000 cu ft/s (85 m³/s). The drop between the border and Hartney is only about six inches per mile (9.5 cm/km).

Location	1882 Peak Flow (cfs) (Estimated) ^[5]^[6]^[7]^[8]	1976 Peak Flow (cfs) ^[9]	2011 Peak Flow (cfs) ^[10]^[11]^[12]
Minot	22,813.3^[13]	9,350	26,900
Westhope	18,500^[14]	12,400	30,400
Melita	30,017.5^[15]	21,300	26,800
Souris	N/A	24,800	28,200
Wawanesa	39,905.6^[16]	26,200	27,800

Tributaries

Long Creek
Short Creek
Moose Mountain Creek
Des Lacs River
Livingston Creek
Wintering River
Deep River
- Little Deep Creek
  - Spring Coulee
- Cut Bank Creek (North Dakota)
  - North Lake
    - Egg Creek
      - Hay Coulee
    - Buffalo Lodge Lake
      - South Egg Creek
Willow Creek
- Snake Creek (North Dakota)
- Oak Creek
- Ox Creek
  - Wolf Creek
Plum Creek (Manitoba), a river that drains Plum Lakes and Oak Lake (Manitoba) into the Souris River
- Stony Creek, flows into Maple Lake, which drains into Plum Lakes
- Pipestone Creek (Saskatchewan), flows into Oak Lake
  - Little Pipestone Creek
  - Montgomery Creek
Jackson Creek
Graham Creek
Boundary Creek (North Dakota)
Antler River
Gainsborough Creek

Communities along the river

Cities and towns

Rural Municipalities

Bridges across the river

Eastwood Park Bridge: NRHP-listed crossing in Minot, North Dakota
Elliott Bridge: NRHP-listed crossing in McHenry County, North Dakota
Westgaard Bridge: NRHP listed crossing in McHenry County, North Dakota

Fish species

Fish species include walleye, yellow perch, northern pike, white sucker, black bullhead, goldeye, brown bullhead, smallmouth bass, and burbot.

References

^ "Natural Resources Canada-Canadian Geographical Names (Souris River)". Retrieved 2014-08-29.
^ "Atlas of Canada Toporama". Retrieved 2014-08-29.
^ "Proglacial Lakes". Esask. Government of Saskatchewan. Retrieved 31 March 2022.
^ Archived data from Water Survey Canada
^ Rannie, William .F. (2002). B.D. Thraves (ed.). "The Role of the Assiniboine River in the 1826 and 1852 Red River Floods" (PDF). Prairie Perspectives: Geographical Essays. 5. Regina: University of Regina, Department of Geography: 56–75.
^ Eugene F. Kozera, P. Eng. (2011). "Recent Flooding and Flood Mitigation in Manitoba" (PDF). Province of Manitoba.
^ "Water Survey of Canada - SOURIS RIVER AT MELITA (05NF001)". Environment Canada.
^ "Water Survey of Canada - SOURIS RIVER AT WAWANESA (05NG001)". Environment Canada.
^ "Daily Water Levels and Forecasts Souris River May 23, 2011" (PDF). Province of Manitoba. 2011.
^ "Mouse River Enhanced Flood Protection Plan - Preliminary Engineering Report" (PDF). North Dakota State Water Commission. February 29, 2012.
^ "2011 Post-Flood Report for the Souris River Basin – Revised March 2012" (PDF). US Army Corps of Engineers St. Paul District. March 2012.
^ "Daily Flood Sheet Souris River July 12, 2014" (PDF). Province of Manitoba. 2014.
^ Converted from 646 (m³/s)
^ Estimated from graph
^ Converted from 850 (m³/s)
^ Converted from 1130 (m³/s)

External links

Media related to Souris River at Wikimedia Commons
USGS Canoeing Information
International Joint Commission page on the Souris River
Rafferty and Alameda Dams
West Souris River Conservation District
Fish Species of Saskatchewan
Encyclopedia of Saskatchewan

[1] "Natural Resources Canada-Canadian Geographical Names (Souris River)". Retrieved 2014-08-29.

[Atlas_of_Canada-2] "Atlas of Canada Toporama". Retrieved 2014-08-29.

[3] "Proglacial Lakes". Esask. Government of Saskatchewan. Retrieved 31 March 2022.

[4] Archived data from Water Survey Canada

[5] Rannie, William .F. (2002). B.D. Thraves (ed.). "The Role of the Assiniboine River in the 1826 and 1852 Red River Floods" (PDF). Prairie Perspectives: Geographical Essays. 5. Regina: University of Regina, Department of Geography: 56–75.

[6] Eugene F. Kozera, P. Eng. (2011). "Recent Flooding and Flood Mitigation in Manitoba" (PDF). Province of Manitoba.

[7] "Water Survey of Canada - SOURIS RIVER AT MELITA (05NF001)". Environment Canada.

[8] "Water Survey of Canada - SOURIS RIVER AT WAWANESA (05NG001)". Environment Canada.

[9] "Daily Water Levels and Forecasts Souris River May 23, 2011" (PDF). Province of Manitoba. 2011.

[10] "Mouse River Enhanced Flood Protection Plan - Preliminary Engineering Report" (PDF). North Dakota State Water Commission. February 29, 2012.

[11] "2011 Post-Flood Report for the Souris River Basin – Revised March 2012" (PDF). US Army Corps of Engineers St. Paul District. March 2012.

[12] "Daily Flood Sheet Souris River July 12, 2014" (PDF). Province of Manitoba. 2014.

[13] Converted from 646 (m³/s)

[14] Estimated from graph

[15] Converted from 850 (m³/s)

[16] Converted from 1130 (m³/s)

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