Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Office of Planning, Environment, & Realty (HEP)
PlanningEnvironmentReal Estate

HEP Events Guidance Publications Awards Contacts

[Text only]
Paw Print Wildlife and Highways: An Overview Tortoise Underpasses Badger Tunnels Four Tools to Assess Wildlife Linkage Areas Programs to Remove Fish Passage Barriers Bear Underpasses Salamander Tunnels Passages for Large Mammals Goat Underpasses Computer Model Highway-Wildlife Relationships Amphibian-Reptile Wall and Culverts An Overpass for Animals and Humans
PreviousPrevious Table of Contents NextNext

Goat Underpasses

Montana
Photo: Mountain goat
Mountain goats are white and bearded, with long hair, black hooves, and short black horns that curve slightly backwards. They live on rocky crags at or above timberline, where they feed on high-mountain vegetation. Their home range is 3-6 miles (4.8-9.7 km). In the wild, mountain goats can live 12 years or more. They can be seen in the Black Hills of South Dakota and in 5 national parks: Glacier, Olympic, Mt. Rainier, Banff, and Jasper.

From April through August for the past 19 years, mountain goats in Glacier National Park have been using specially designed passages under U.S. Highway 2 to get to a natural salt lick along the banks of the Middle Fork of the Flathead River.

After a 1979 avalanche destroyed a section of U.S. 2 near the salt lick, the Montana Department of Transportation used FHWA funds to build a goat passage under a new highway bridge and to adapt an existing bridge for safe goat passage. Goats were kept off the highway with a wall downhill and a fence uphill.

Photo: Underpass Security for goats crossing under the bridges was enhanced by fastening metal screening to the bridge rail and by planting 40 conifer trees. Existing goat trails were obliterated and new trails leading to the underpasses were dug. Visitors were accommodated - and the risk of human interference minimized - with an off-road overlook away from the underpasses.

Before and during road and bridge construction, workers went out of their way to protect the mountain goats from disturbances. They delayed construction until early August 1980 and limited it to certain hours of the day. They located construction away from key crossing zones. They restricted speed limits and stopped all passing vehicles for crossing goats. They sequenced construction activities so goats could gradually adapt.

Their extra effort paid off. Within weeks of construction, only a few crossing goats moved around the ends of the fence to cross the highway, and the goats seldom hesitated or ran back at the bridges or when they encountered visitors. Less than half showed signs of fear (erect tails).

In the first year, 99.4 percent of the crossing goats used the underpasses, and the number of individual lick visits doubled. Some goats even extended their visits to the lick into fall and winter. By 1984 all of the crossing goats used the underpasses.

Photo: Underpass Mountain goats used to cross U.S. 2 to get to a salt lick on the other side of the canyon. Now they can get there on rocky passageways underneath these bridges, shielded from view by tree cover and the steep hillside.

Today, nearly 20 years after project completion, mountain goats continue to use the underpasses to cross U.S. 2 and enter the path to the salt lick.

For more information contact Mark Traxler at 406-444-6257 or mtraxler@state.mt.us, or Gerald Wright at 208-885-7990 or gwright@uidaho.edu

Previous | Table of Contents | Next
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000