How wildlife crossings protect both animals and people

Interstate 90 is the longest interstate highway in the United States. Spanning more than 3,000 miles, it connects Seattle in the west to Boston in the east. But it also serves as a massive concrete divide. For the animals who live to the north and south of the interstate, this road has absolutely wrecked their commute.

The U.S. Forest Service and the Washington State Department of Transportation have teamed up to develop a network of "critter crossings" in Washington – overpasses and underpasses designed to provide safe passage for wildlife.

The crossing project, with structures at areas identified where animals are likely to cross, spans 15 miles of I-90 near the Snoqualmie Pass in Washington, flanked by large chunks of what's primarily national forest land – habitat for all sorts of creatures great and small.