Crossing the Missouri River

The previous 75-year-old structures were at the end of their design lives. They also had a treacherous curve with no shoulders, and inspections showed cracking in some critical areas. In 2011, the Montana Department of Transportation (MDT) completed a simulation on the US-287 corridor crossings of the Missouri River and the Montana Rail Link tracks near Toston to look for ways to improve the corridor. This segment was the site of many bad crashes, so in 2013 they selected Morrison-Maierle to take on the project.

The new Toston Structures consist of a 661-foot-long highway bridge—and an adjacent 350-foot-long railroad bridge—over the Missouri River in Montana between Townsend and Three Forks. The structures have intermediate river piers, steel beams and cross frames, and nearly 7,000 sq. ft. of concrete decks between them.