Soo Line High Bridge

Arcola High Bridge, Somerset, WI (johnweeks.com) The Arcola High Bridge is the most spectacular river crossing in the Twin Cities metro area. It crosses the nearly mile wide Saint Croix River Valley between the village of Arcola, Minnesota, and Somerset, Wisconsin. It consists of five huge steel arches that tower nearly 200 feet over the bottom of the valley.
Soo Line High Bridge (Wikipedia) The Soo Line High Bridge, also known as the Arcola High Bridge, is a steel deck arch bridge over the St. Croix River between Stillwater, Minnesota and Somerset, Wisconsin, United States. It was designed by structural engineer C.A.P. Turner and built by the American Bridge Company from 1910 to 1911. The bridge was listed on the National Register of Historic Places in 1977 for its national significance in the themes of engineering and transportation. It was nominated for its exceptional dimensions, beauty, innovative engineering techniques, and importance to transportation between Minnesota and Wisconsin.
The bridge is 184 feet (56 m) above the river and 2,682 feet (817 m) long, with five steel arches towering above the river.
The crossing of the St. Croix River was difficult for the railway, since the original bridge across the river was very low and trains had to contend with steep grades on both sides of the river. This made it necessary to use helper engines and to make trains shorter.