Most of the wildlife underpasses along US Hwy 93 on the Flathead Indian Reservation in Montana are elliptical metal culverts that are about 7 m wide and 4-5 m high. This particular wildlife underpass is located near Evaro and not only allows animals to pass safely underneath the highway, but there is also a stream that flows through the structure. The wildlife overpass is in the background. Both the underpasses and the overpass are used by a wide variety of species. More information, including images of animals using the structures can be found at the following websites:
Outreach through People's Way Partnership: http://www.peopleswaywildlifecrossings.org/
Like the work of the People's Way Partnership on facebook: http://www.facebook.com/US93PeoplesWay
Montana Department of Transportation: http://www.mdt.mt.gov/research/projects/env/wildlife_crossing.shtml
Confederated Salish and Kootenai Tribes: http://www.cskt.org/wlc.htm
Western Transportation Institute at Montana State University: http://www.westerntransportationinstitute.org/research/roadecology/specialprojects.aspx
All content © 2012 Marcel Huijser
Wildlife underpass (foreground) and overpass (background), Flathead Indian Reservation, near Evaro, Montana, USA