Minnesota State Highway 45 is a short highway in northeast Minnesota, which runs from its intersection with State Highway 210 (Chestnut Avenue) and Carlton County Road 1 in the city of Carlton and continues north to its northern terminus at its interchange with Interstate 35 and Carlton County Highway 45 in the city of Scanlon.
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From 1958 to 1973, Highway 39 had continued farther west, extending over present-day State Highway 210 through Jay Cooke State Park to then-U.S. Highway 61 (now State Highway 45) at Carlton.