The Hardy Bridge is a Warren through truss, three-span, two-lane bridge over the Missouri River. It is located at milepost 6 on Old U.S. Route 91 about 14 miles (23 km) southwest of Cascade, Montana, in the United States. Constructed in 1931, it was one of many similar bridges built during a great expansion of bridges and roadways in the state of Montana. It was added to the National Register of Historic Places on January 4, 2010.
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