How North America is building the world's largest wildlife corridors

Across North America, more than four million miles of paved roads and highways slice through dense forests, arid deserts, and rugged mountain ranges. For decades, this sprawling, car-centric infrastructure has acted as an invisible cage, trapping wildlife in shrinking islands of habitat and turning routine seasonal migrations into deadly gauntlets. Animals attempting to cross busy interstates face overwhelming odds, leading to catastrophic population declines for vulnerable species and dangerous conditions for human drivers. But a quiet, multi-billion-dollar revolution is currently reshaping the continent's map. Driven by a rare alignment of federal funding, Indigenous leadership, and ecological science, North America is currently undertaking the largest habitat reconnection effort in modern history, fundamentally altering how civil engineering interacts with the natural world.[1]

Rather than simply walling off isolated national parks and hoping for the best, governments, Indigenous nations, and conservationists have shifted their entire philosophy toward "ecological connectivity"—the active process of stitching the North American landscape back together. By building dedicated wildlife crossing infrastructure and establishing vast, co-managed conservation corridors, they are engineering safe passage for everything from migrating pronghorn to apex predators. This approach recognizes that nature is not static; animals must move to find food, secure mates, and adapt to shifting climate zones. When habitats are fragmented by human development, isolated populations suffer from genetic bottlenecks and localized extinctions. The new paradigm treats the landscape as a continuous, living network where human infrastructure must accommodate, rather than block, the ancient rhythms of wildlife movement.[1]

The momentum behind this continental shift has reached unprecedented levels throughout 2025 and 2026, catalyzed by massive injections of public capital. In the United States, the Bipartisan Infrastructure Law established a first-of-its-kind $350 million Wildlife Crossings Pilot Program, specifically earmarked to help states and tribes build dedicated overpasses and underpasses. The initiative proved so overwhelmingly popular that demand from local governments outstripped available funds by a staggering factor of five during the initial grant cycles. In late 2024 and early 2025, the Federal Highway Administration disbursed $125 million to 16 different projects, funding everything from statewide collision hotspot studies to the construction of massive, vegetated land bridges over multi-lane interstates.[2][3]

The broad appeal of these structures easily bridges the usual partisan divides because the underlying economics are completely undeniable. Nationwide, wildlife-vehicle collisions cost billions of dollars annually in property damage, medical bills, and emergency response, while resulting in hundreds of human fatalities. Transportation officials and highway engineers have realized that building vegetated overpasses and guided underpasses is significantly cheaper in the long run than doing nothing. Instead of viewing these projects as environmental charity, state departments of transportation now treat them as highly effective, fiscally responsible safety interventions that protect human lives just as much as they protect local ecosystems.[2][6]

The financial math plays out clearly on the ground in places where the infrastructure has already been tested. In Wyoming, the state built a series of specialized overpasses and underpasses at Trappers Point to protect a historic pronghorn migration route that intersected with a dangerous stretch of U.S. Highway 191. The ambitious project cost $12 million to complete, but state engineers estimate the structures will entirely pay for themselves in just 17 years. By drastically reducing the rate of vehicular damage and the need for highway patrol responses, the crossings provide a continuous return on investment while ensuring the survival of a migration corridor that has been used by pronghorn for thousands of years.[3]

This localized infrastructure is feeding into massive, continent-spanning visions, most notably the Yellowstone to Yukon (Y2Y) Conservation Initiative. Stretching 2,100 miles from the high plains of Wyoming all the way to the Arctic Circle, the Y2Y corridor is widely considered one of the most ambitious large-landscape conservation projects on Earth. Since its inception in 1993, the initiative has worked with hundreds of partners to ensure that the Rocky Mountain ecosystem remains a continuous, unbroken chain of wilderness. Rather than relying on a single government mandate, the Y2Y project weaves together national parks, private land easements, and targeted highway crossings to create a contiguous wildway.[4]

The tangible results of the Y2Y effort are becoming highly visible across the western half of the continent. According to recent impact reports, 204 purpose-built wildlife crossing structures now bridge busy roads across the Yellowstone to Yukon region, with dozens more currently in the planning and construction phases. This physical infrastructure, combined with the conservation of 45,000 hectares of private land in critical bottleneck areas like British Columbia's Elk Valley, is actively repairing the genetic flow of vulnerable species. By securing these vital pinch points, conservationists are ensuring that wide-ranging mammals have the space they need to thrive in a rapidly changing environment.[4]

For apex predators like grizzly bears, the progress is measurable in miles and represents a massive victory for genetic diversity. In 1993, grizzly populations in the lower 48 states were isolated by gaps of up to 150 miles, leaving them trapped in fragmented pockets, highly vulnerable to inbreeding, and at severe risk of localized extinction. Today, thanks to restored corridors and the strategic placement of highway crossings, that isolation gap has shrunk to just 45 miles. This incredible reduction allows previously disparate bear populations to finally reconnect, share genetic material, and establish a much more resilient presence across the Northern Rockies.[4]

Crucially, this modern era of ecological connectivity is being heavily driven by Indigenous leadership and traditional stewardship. In Canada, Indigenous Protected and Conserved Areas (IPCAs) have become the primary engine for meeting international biodiversity targets. These are formal, nation-to-nation agreements where Indigenous governments co-manage vast tracts of land with federal or provincial authorities. Unlike traditional colonial conservation models—which historically evicted native peoples to create pristine, untouched parks—IPCAs recognize that human beings have actively managed and sustained these ecosystems for millennia, and that traditional knowledge is essential to maintaining the health of the landscape.[5]

In the Northwest Territories alone, Indigenous nations have established three massive IPCAs since 2018, protecting over 50,000 square kilometers—an area roughly the size of Costa Rica. Projects like Thaidene Nëné, led by the Łutsël K'e Dene First Nation, ensure that traditional stewardship practices maintain the health of vital caribou herds, salmon runs, and boreal forests. Similarly, the Dehcho First Nations passed a Dene law to protect 14,249 square kilometers of forest, creating the Edéhzhíe protected area. These massive, contiguous blocks of protected land serve as the foundational anchors for North America's broader wildlife corridor network.[5]

Similar Indigenous-led connectivity efforts are rapidly accelerating in the United States, fueled by the new influx of federal infrastructure grants. The Confederated Salish and Kootenai Tribes recently secured $8.6 million to construct wildlife overpasses across U.S. Highway 93 in Montana's Ninepipe National Wildlife Management Area. These structures are specifically designed to reduce grizzly bear collisions and link vital wetland habitats. By directing federal resources directly to tribal governments, the crossing program is not only improving ecological outcomes but also addressing long-standing issues of rural equity and infrastructure underinvestment in tribal communities.[3]

Further south, the Santa Ana Pueblo in New Mexico is utilizing federal funds to track mountain lion and elk movements across tens of thousands of acres of high desert. By deploying GPS collars and mapping exactly where animals attempt to cross the landscape and the Rio Grande corridor, tribal wildlife managers are gathering critical data. This precise tracking allows them to pinpoint the exact locations where future culverts and bridges will be most effective. One tracked mountain lion even traveled more than 550 miles from the Pueblo to Mesa Verde National Park, perfectly illustrating the vast distances these animals require to survive.[6]

The sheer scale of this continental rewiring was recently captured in the 2025 update to the North American Protected Areas map, published by the Commission for Environmental Cooperation. The comprehensive data reveals a shifting landscape where strict nature reserves are increasingly linked by "other effective area-based conservation measures" (OECMs). These OECMs include working lands, private ranches, and managed forests that prioritize biodiversity alongside sustainable human use. The map visually confirms that the continent is slowly transitioning from a patchwork of isolated green islands into a cohesive, interconnected web of life.[7]

As the initial $350 million federal pilot program approaches its final funding rounds in late 2025, a broad and unusual coalition of transportation departments, conservationists, and tribal leaders is actively lobbying Congress to make the funding permanent. With public polling showing 86 percent of Americans support dedicating resources to reduce wildlife-vehicle collisions, the movement has achieved rare bipartisan consensus. For the first time in a century of aggressive highway building, North America is redesigning its infrastructure not just to move people and freight, but to ensure the natural world can safely move alongside them.[2]