Petition: A New Interstate Could Carve Through Yellowstone and Wall Off Its Wildlife

The Greater Yellowstone ecosystem is one of the largest nearly intact wild landscapes in the temperate world — home to wolves, bison, elk, pronghorn, grizzlies, and hundreds of other species. Now a bill in Congress, the I-47 Future Interstate Act (S. 4484), would upgrade U.S. Highway 287 to interstate standards through the region. Introduced in May 2026 and nicknamed the “Trump Interstate,” the proposal would add lanes, a wider median, and new exit ramps along a corridor that runs through vital wildlife habitat. Conservationists and road ecologists warn that bigger highways act as barriers to animal movement: research on Wyoming’s I-80 found pronghorn were roughly 300 times less likely to cross an interstate than a state highway. For wildlife that must migrate to find food, breed, and survive harsh winters, that kind of barrier can be devastating. Please sign the petition urging the Senate to reject the bill.

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Wildlife across Greater Yellowstone needs to move freely to survive, and a new interstate through the heart of their habitat could sever those routes. Sign the petition urging the U.S. Senate Committee on Environment and Public Works to reject the I-47 Future Interstate Act and protect the ecosystem’s animals from habitat fragmentation. One Green Planet has covered how roads endanger wildlife — and how crossings can help — in how cities are working to protect wildlife from traffic collisions, and you can read a detailed look at what the proposed interstate would mean via Montana Free Press.

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