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Chapter 3: Geologic Structure and Landforms

3.77: The Souris Spillway South of Coulter

The photograph shows the Souris spillway just north of the Canada/U.S.A. border in southwestern Manitoba. It carried water from glacial Lake Souris to the south to glacial Lake Hind to the north.[i] As with previous examples, it has a flat floor and steep sides, but in this case they are only 50 feet (15.2 m) high. Both sides are picked out by patches of scrubby trees (1 and 2) in slightly wetter areas of this dry part of Manitoba. The Souris River 3, which has obviously been straightened, flows from south to north. A light-toned embankment 4 can be seen along the east side of the river. Several small intermittent streams 5 flow towards the main river. Land on either side of the spillway is extremely flat.

In this driest part of Manitoba, water is scarce resulting in the damming of two creeks to create reservoirs 6 and construction of two dugouts 7. Some section lines of the DLS system can be seen 8 and in the southeast is a gravel road—light-toned—constructed along one of them 9.

Figure 3.77: The Souris Spillway South of Coulter

Figure 3.77: The Souris Spillway South of Coulter

Figure 3.77

Vertical air photograph: A16181-17

Flight height: 10,500 feet a.s.l.; lens focal length: 152.63 mm

Date: July 20, 1958

Scale: 1:18,100 (approx.)

Location: Township 1; Ranges 26 and 27 WI

Map sheets: 1:250,000 62F Virden

1:50,000 62F/ 2 Waskada


[i] For details see Kehew, A. E. and Clayton, L. “Wisconsinan floods and development of the Souris-Pembina spillway system in Saskatchewan, North Dakota and Manitoba” in Glacial Lake Agassiz eds. J. T. Teller and L. Clayton. St. Johns: Geological Association of Canada, Special Paper 26, 1983, 187-209.