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Table of Contents
Foreword
Preface
Glossary

Chapter 16: Water Resources

16.40: Flooding in the Assiniboine Valley Near Shellmouth

This photo shows extensive spring flooding in the Assiniboine Valley. Here the Assiniboine River occupies a wide 0.5 miles (0.8 km) to 1.0 mile (1.6 km) flat-floored spillway. Once the river has overtopped its banks, there is little to stop water from spreading over the whole spillway floor. The normal channel of the south-flowing river 1 and some abandoned channels 2 can be identified with floodwater on both sides 3. Where the valley floor is wooded, treetops project above the floodwaters 4. The bridge 5 on PR 549 6 is intact, but the road has been breached by floodwater further west 7, with a sediment plume 8 extending downstream. A north/south gravel road is flooded in several places 9.

Also of note on this photo are gravel pits 10, one with a pile of processed gravel 11 excavated into Assiniboine River terraces; the former course of the CP railway line (long abandoned) 12; and the small hamlet of Shellmouth 13.

Figure 16.40: Flooding in the Assiniboine Valley Near Shellmouth

Figure 16.40: Flooding in the Assiniboine Valley Near Shellmouth

Figure 16.40

Vertical air photograph: MB 95001-154

Flight height: 6,800 feet a.s.l.; lens focal length: 152.815 mm

Scale 1:12,000 (approx.)

Date: May 13, 1995

Location: Township 22; Range 29WI

Map sheets: 1:250,000 62K Riding Mountain

                    1:50,000 62K/14 Inglis