Idaho Built a Highway Underpass So Deer Can Commute Safely

Imagine being a deer in Idaho, just trying to get across the highway for some prime foraging, only to realize it's a six-lane death trap. For years, that was the reality for thousands of migrating animals — and a major headache for drivers.

But soon, thanks to a multi-year, multi-agency effort, deer in southeast Idaho will have their own private underpass system. No more dodging semis, just a leisurely stroll beneath U.S. Highway 30, south of Montpelier. Because apparently, that's where we are now: building infrastructure for wildlife commutes.

The Rocky Point Wildlife Underpass, set to open this fall, isn't just one tunnel. It's three underpasses, complete with miles of fencing on either side, all designed to gently guide deer and other critters away from oncoming traffic and directly into their designated safe passage. Think of it as a velvet rope for the animal kingdom, but with concrete.

The Problem: Deer vs. Dollar Signs

Justin Smith, a public information officer for the Idaho Transportation Department, laid out the grim stats: "We were losing at least 100 deer a year." Over a decade, that's a staggering 1,000 known animal casualties. Which, if you think about it, is both heartbreaking for the deer and incredibly expensive for humans.

Deer-vehicle collisions aren't just a bummer; they cost drivers and taxpayers millions annually. "Our primary concern is the safety of the traveling public," Smith noted, adding that keeping people safe on highways, especially in wildlife-rich areas, is a key goal. And apparently, keeping deer off your windshield is a big part of that.

This particular project is a veritable who's who of local and national groups, including the Idaho Transportation Department, Idaho Department of Fish and Game, the Greater Yellowstone Coalition, and the Idaho Conservation League. Matt Lucia from the Greater Yellowstone Coalition summed it up: "Rocky Point shows what’s possible when agencies, conservation, and sporting groups, and local communities work toward the same goal." And that goal, it seems, is less splattered wildlife.

Under Budget and Overachieving

The price tag for this deer paradise? A cool $20.8 million, largely covered by a grant from the Federal Highway Administration’s Wildlife Crossing Pilot Program, which itself is part of the 2021 federal Infrastructure Investment and Jobs Act. The grant was expected to cover 98% of the costs, and Smith even hinted that the project might come in under budget. Imagine that: a government project that saves money. Someone's accountant just had a small, joyful heart attack.

This isn't Idaho's first rodeo with animal infrastructure. Back in 2023, the state opened the Cervidae Peak Wildlife Overpass (yes, an overpass — for deer who prefer the high road) on Idaho Highway 21. A time-lapse video from last year captured over 1,000 deer using it safely in just two months. Let that satisfying number sink in.

With Idaho’s population continuing its upward trajectory, the state is actively looking into more wildlife crossings. The Legislature even passed a resolution encouraging state and federal leaders to support wildlife corridors. Because when it comes to keeping both drivers and deer safe, sometimes you just need to build a really fancy tunnel.