The Theodore Roosevelt Expressway (also known as the National Highway System High Priority Corridor 58), is made up of several existing highways between Rapid City, South Dakota and the Port of Raymond between Saskatchewan and Montana.

The corridor is approximately 445 miles (716 km) long with the majority of the highway two lanes.

[2] Congress designated the route as one of 80 National Highway System High-Priority Corridors in 2005 by the Intermodal Surface Transportation Efficiency Act.

[2] After crossing the state line, the highway continues north along U.S. 85 through Bowman, Amidon, Belfield (where it intersects Interstate 94), Fairfield, Grassy Butte, Watford City and Alexander before its junction with U.S. 2 just west of Williston.

[5] Through Montana, the route runs 88 miles (142 km) from the North Dakota state line to the Canada–US border.