Theodore Roosevelt Expressway

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. It is the northern third of the Ports to Plains Alliance. The corridor is approximately 445 miles (716 km) long with the majority of the highway two lanes. Congress designated the route as one of 80 National Highway System high-priority corridors in 2005. The designation did not create new design standards or create new eligibility for any additional Federal funding.

The route begins in Rapid City, South Dakota and runs north on U.S. Route 85 to Williston, North Dakota. From Williston, the route turns west on U.S. Route 2 to Culbertson, Montana where it turns north on Montana Highway 16 to the Canada–US border at Raymond, Montana. The expressway takes its name from former President of the United States Theodore Roosevelt.

Through South Dakota, the route runs 160 miles (257 km) from Rapid City to the North Dakota state line. The route runs concurrent with Interstate 90 from Rapid City west through Sturgis en route to Spearfish where it turns north onto U.S. 85. The route then continues in a northerly direction through Belle Fourche, Redig, Buffalo and Ludlow en route to the North Dakota state line.

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