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Chapter 3: Geologic Structure and Landforms

3.80: Langs Valley North of Dunrea


The photograph shows Langs Valley 1, a large spillway occupied by a small misfit stream 2. Langs Valley[i], delimited by the dashed lines on the photo, is part of the Souris-Pembina spillway that carried water from glacial Lake Hind to glacial Lake Agassiz. After the glacial lakes disappeared, the spillway was occupied by the Souris River that flowed eastward to join the Red River south of the Canada/U.S.A. border. However, the Souris was captured just west of the photo and redirected northward through the Tiger Hills to join the Assiniboine near Treesbank. Now a large spillway is occupied by a tiny misfit stream 2 that flows west; i.e., opposite to the original flow, to join the Souris near the elbow of capture. It has eroded a steep-sided valley into the spillway floor. The spillway’s southern wall 3 is steep and well wooded. It is dissected by two steep-sided creek valleys 4 where some slopes are too steep to support woodland. The northern valley wall 5 is not as steep and has a well-marked terrace 6 into which two small gravel pits 7 have been excavated.

This is a large-scale, low-level photo on which section lines 8 are clearly defined. Roads follow section lines with some accommodation for the topography 9. Five forms 10 can be seen in this area of 6 ¼ square miles (16.2 sq km).

Figure 3.80: Langs Valley North of Dunrea

Figure 3.80: Langs Valley North of Dunrea

Figure 3.80

Vertical air photograph: A16182-84

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

Date: July 22, 1958

Scale: 1:17,600 (approx.)

Location: Township 5; Range 18 WI

Map sheets: 1:250,000 62G Brandon

1:50,000 62G/5 Dunrea


[i] “Named after the Reverend James Lang who ran a popular campground in the valley in 1880” G. Holm ed. Geographical Names of Manitoba, Winnipeg: Manitoba Conservation, 2000, 143.