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US-93 Wildlife Crossings

Polson, Montana


Montana Department of Transportation


Stahly Engineering & Associates


Schellinger Construction Co.


Summer 2006

Along US-93 in Polson, Montana, a large number of accidents are caused by deer, bears and other wildlife crossing the highway. A multi-phase project launched by the MDT, the Federal Highway Administration and local Native American tribes was put into motion that included several wildlife crossings along the corridor.

In 2006, the first phase of the project included installation of SUPER-SPAN™ high profile arches with Keystone® end treatments. Additionally, three CON/SPAN® structures with Keystone® end treatments were installed to encourage wildlife to cross under the highway.

“The crossings are all very new, but seem to be working,” said Pat Basting, district biologist for MDT. “The structures were already being used by animals before we buttoned up the fences. They are improving the permeability for wildlife to move back and forth.”

During the installation, MDT required two lanes on US-93 be open at all times to accommodate the flow of traffic. Crews also encountered the challenges of high groundwater and working in close proximity to protected areas such as wetlands and culturally significant Native American lands.

MDT and the tribes wanted all work completed within one year. Schellinger crews worked in two shifts, nine hours each for six days a week. Ongoing phases will include additional wildlife underpasses along US-93.

Technical Description:

  • Span: 25 ft - 5 in (2), 27 ft - 11 in
  • Rise 16 ft - 6 in (2), 19 ft - 5 in
  • Length: 48 ft, 60 ft, 72 ft
  • Product: SUPER-SPANTM

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