Oil pipeline crossing sites utilized in winter by moose, Alces alces, and caribou, Rangifer tarandus, in southcentral Alaska

  • Published source details Eide S.H., Miller S.D. & Chihuly M.A. (1986) Oil pipeline crossing sites utilized in winter by moose, Alces alces, and caribou, Rangifer tarandus, in southcentral Alaska. The Canadian Field-Naturalist, 100, 197-207.


This study is summarised as evidence for the following.

Action Category

Install crossings over/under pipelines

Action Link
Terrestrial Mammal Conservation
  1. Install crossings over/under pipelines

    A study in 1977–1978 of a pipeline across tundra in Alaska, USA (Eide et al. 1986) found that pipeline sections elevated specifically to permit crossings of animals underneath were not used by moose Alces alces or caribou Rangifer tarandus more than were other elevated sections. Of 81 crossing sections elevated to facilitate mammal crossings, 13 (16%) were used by moose, a similar rate to the 754 of 6,526 other elevated sections (12%) that were crossed. Caribou used four of 53 specifically elevated crossing sections (8%) available to them, a lower rate than the 10% of remaining elevated sections used as crossing points. Along a 145-km-long pipeline, 81 pipe sections were elevated specifically to permit large mammal passage underneath. These sections were ≥3 m high. Remaining sections, were of variable, but generally lower, height. All elevated pipe sections were 18.3 m long between supports. Animal passage was determined by footprint surveys after fresh snow. The pipe, separated into three sections, was surveyed on 11–15 occasions in October 1977–February 1978 and 1–5 occasions in March–April 1978.

    (Summarised by: Nick Littlewood)

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