Camp Ripley Bridge

Camp Ripley Bridge, also known as Bridge 4969, is the only remaining unified road–rail bridge over the Mississippi River. It carries both a railroad spur line and Minnesota [State Highway 115] at Camp Ripley in Morrison [County, Minnesota|Morrison County].
It was built in 1930 by the Minneapolis Bridge Company to serve as the key transportation connection for Camp Ripley, the state's first and most significant Minnesota [National Guard] reservation. As Minnesota's only unified road–rail bridge, it was added to the National Register of [Historic Places] in 2015.