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Table of Contents
Foreword
Preface
Glossary

Chapter 18: Transport and Communications: Past and Present

18.41: Route of a Gas Pipeline South of Rapid City

Oil and gas pipelines are visible on air photos because the excavation needed to bury the pipeline rearranges the topsoil and drainage resulting in a different tone than the surroundings. A light-toned line in the south 1 indicates the route of a gas pipeline, even extending into Lake Wahtopanah 2. The line carries gas from Alberta to Sarnia. Lines are as straight as possible but usually do not follow the lines of the DLS system.

Also seen are three abandoned railway lines: one loops south of Rapid City 3; another runs just north of the Little Saskatchewan River 4; and a third 5 veers off to the northwest. PTH 24 passes through Rapid City 6 and leads westward to Oak River (off the map to the west).

Note also 1) a small dam on the Little Saskatchewan River 7 that produces a reservoir 8 which is used as a recreation site; and 2) numerous small sloughs in this area underlain by ground moraine, ranging in tone from dark grey 9 to almost white 10, a result of specular reflection.

Figure 18.41: Route of a Gas Pipeline South of Rapid City

Figure 18.41: Route of a Gas Pipeline South of Rapid City

Figure 18.41

Vertical air photograph: A20471-237

Flight height: 21,900 feet a.s.l.; lens focal length: 6 inches

Scale: 1:40,900 (approx.)

Date: May 22, 1968

Location: Townships 12 and 13; Ranges 19 and 20WI

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

                    1:50,000 62K/1 Rivers