Wyoming | Interstate Highways | U.S. Routes | Highways 10-96 | Highways 110-296 | Highways 310-789 | This starts at the northwestern corner of the state and moves clockwise around it Eastern Yellowstone National Park Boundary: Heading westbound: Heading eastbound: (Wapiti, WY) Final westbound reassurance marker, entrance to Yellowstone. First eastbound reassurance marker. —————————————————————- Montana State Line: (Cooke City, MT). We enter Wyoming- the Forest Service … Continue reading State Line Crossings