The highway left Maine through the White Mountains of New Hampshire and the Green Mountains of Vermont to cross Lake Champlain by ferry into New York. The highway went through Ontario from Niagara Falls to Windsor and from Detroit through Michigan's Upper Peninsula to Duluth, Minnesota, and then through North Dakota and Montana. The highway passed through northern Idaho and Yakima, Washington, to follow the Columbia River into Oregon. U.S. Route 2 (US 2) was numbered along similar routing through the United States in 1926, although neither Portland was included. The eastern end of the Theodore Roosevelt International Highway was designated US 302 in 1935, and is still known in Maine as the Roosevelt Trail.