Idaho to add underpasses

On a narrow stretch of U.S. 30 south of Montpelier, Idaho, spring migration has long collided with traffic. Thousands of mule deer move through Rocky Point each year on their way between summer range in the Caribou Mountains and winter range on the Bear Lake Plateau, and drivers have paid for that geography with bent hoods, dead animals, and a steady sense that this road turns dangerous at exactly the wrong moment. This month, Idaho will begin building three wildlife underpasses there, along with six miles of eight-foot fencing meant to steer animals away from the pavement and into the crossings. The state expects construction to finish in fall 2026. (itd.idaho.gov, idfg.idaho.gov) The project is small enough to describe in one sentence and large enough to change how the highway works. Idaho Transportation Department plans to install two concrete box culverts, one bridge-style underpass, and fencing between mileposts 442 and 448. The structures sit at a topographic pinch point, where the land narrows and migrating deer bunch together before trying to cross the road. In other words, the state is not scattering crossings at random; it is placing them where the landscape already funnels animals. (itd.idaho.gov, itdprojects.idaho.gov) That bottleneck has made Rocky Point one of the worst wildlife-conflict zones on this part of U.S. 30. Idaho says more than 100 mule deer can be hit each year on the 20-mile stretch south of Montpelier, and about 70 percent of the carcasses on that segment are reported in the four- to five-mile Rocky Point section alone. The state’s broader numbers show why transportation agencies now treat this as a road-safety problem, not just a wildlife problem: Idaho averages about 1,010 crashes involving wildlife each year, and in most years those crashes kill between one and four people. (itd.idaho.gov, itd.idaho.gov) The fencing is as important as the tunnels. An underpass only helps if an animal reaches it, and deer do not naturally queue up for infrastructure. The fences block the easy dash across open asphalt and guide animals along the roadside until they find an opening underneath. That design has a long track record: studies of deer crossings have found that underpasses paired with fencing can cut wildlife deaths and collisions substantially, because the system works as a package rather than as a hole under the road. (itd.idaho.gov, usgs.gov) The money behind the project shows how wildlife crossings have moved from local wish list to federal transportation policy. Idaho Transportation Department says this Montpelier work is a $12 million project funded through the Federal Highway Administration’s Wildlife Crossings Pilot Program, part of a December 20, 2024 round that sent $125 million to 16 states. Separate Idaho project documents show the broader Rocky Point effort carrying a higher programmed total cost, including additional fencing support, which helps explain why agencies sometimes cite different figures for the same job depending on whether they mean the core construction contract or the full project budget. (itd.idaho.gov, highways.dot.gov, apps.itd.idaho.gov) For Bear Lake County, the appeal is not abstract. Idaho Fish and Game describes the Bear Lake Plateau mule deer herd as an economic asset that draws hunters and wildlife watchers into the region, and the migration itself crosses state lines, linking habitat in Idaho, Wyoming, and Utah. A road that slices through that route does more than kill deer one by one; it breaks a seasonal movement that has shaped the herd for generations. By late fall, if the schedule holds, the fix at Rocky Point will be visible in ordinary pieces of concrete and fence, and in the quieter sight of deer passing under U.S. 30 instead of across it. (itdprojects.idaho.gov, idfg.idaho.gov)