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Providing evidence to improve practice

Individual study: Evaluation of a wildlife underpass on Vermont State Highway 289 in Essex, Vermont

Published source details

Austin J.M. & Garland L. (2001) Evaluation of a wildlife underpass on Vermont State Highway 289 in Essex, Vermont. Proceedings of the 2001 International Conference on Ecology and Transportation, Center for Transportation and the Environment, North Carolina State University, Raleigh NC, USA, 616-624.


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Install tunnels/culverts/underpass under roads Terrestrial Mammal Conservation

A study in 2000 along a highway in Vermont, USA (Austin & Garland 2001) found that a concrete underpass was used by four mammal species to cross the road. Infra-red monitors recorded 190 confirmed or unconfirmed instances of animals using the tunnel. Where a species was identified, 58% of occurrences were racoon Procyon lotor, 27% were mink Neovison vison, 11% were weasel Mustela frenata and 4% were skunk Mephitis mephitis. The total number of passages by these species was not stated. The underpass was a concrete block structure, split along the middle by a concrete support. It was 97 m long, 3 m wide and 4 m high. A stream flowed through one tunnel and, at times of high water, through both tunnels, though a sloping floor ensured at least some dry passage. The underpass was monitored discontinuously from June–November 2000, using infrared monitors, cameras and footprint pads.

(Summarised by Emily Hardgrove )