Interstate 90 in the US state of South Dakota traverses east–west through the southern half of the state, passing through the cities of Spearfish, Rapid City, Mitchell, and Sioux Falls.
The Lake Francis Case portion of the Missouri River viewed from a rest stop just south of Chamberlain; the pre-Interstate Chamberlain Bridge is in the center
South Dakota Highway 34
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South Dakota Highway 34 is a state route that runs parallel to Interstate 90 across the entire state of South Dakota. It begins at the Wyoming border west of Belle Fourche, as a continuation of Wyomin
SD 34 in Belle Fourche