Chapter 5: Vegetation
In southern and west central
Individual animals are too small to appear on all except very large-scale images. However, some animals (e.g. beaver) profoundly affect drainage systems.
5.21: Beaver Dams in the Central Part of Riding Mountain National Park
The photo shows an area of mixed vegetation in the central part of
Several small streams 6 flow across the area. In some places they have been blocked by beaver dams 7 to produce lakes—very dark-toned—upstream 8. Usually the lakes are narrow occupying creek valleys 9, but in one instance water has spread over a wide area 10 killing trees. A lake that has since drained occupied another dark-toned area 11.
In this central part of the national park there is little evidence of human activity except a poorly defined trail 12 that has been flooded in two locations 13.
Figure 5.21: Beaver Dams in the Central Part of Riding Mountain National Park
Vertical Air Photograph: A20375-169
Flight height: 10,320 feet a.s.l.; lens focal length: 152.47 mm
Date: May 21, 1968
Scale: 1:20,000 (approx.)
Location: 50°54'42” N, 100°29'10” W
Map sheets: 1:250,000 62K Riding Mountain