Montana Department of Transportation


View the Governor’s Coronavirus Task Force site for more information.

Toston Structures Project Toston Structures Project

Main Content

Public Involvement

Toston Structures Project

Toston Structures Project logo

Project Overview

Current Project Status

Construction began on the Toston Structures project in April 2019. It continued throughout 2019 and is ongoing. Piers and steel girders for the Missouri River Bridge were completed in early August 2020, bridge deck form work was completed in September 2020, and it is anticipated that deck concrete placement will be finished by October 9th. Concrete barrier rail is scheduled to begin being placed the week of October 19, 2020. Paving of the road is beginning the week of October 5th and will continue for several weeks. While paving is taking place, traffic will continue to travel on a finished gravel surface. Flaggers, signal lights, and signs with reduced speed instructions are in place to assist with traffic flow and to manage work trucks entering/exiting the site. Travelers should be prepared to stop for short periods of time and to travel at reduced speeds for approximately 3 miles, resulting in minimal (15 minutes or less) travel delays.

There are substantial areas of the river restricted from use/passage. A passable waterway channel is provided and is visibly marked for the duration of the project.

For weekly construction updates including traffic information, please subscribe to texting updates for 'tostonstructures' to 555888 or email updates at . You may also contact the Public Information Officer directly at 406-698-3668.

Construction on the Toston Structures Project began in April of 2019. The project is in Broadwater County, south of Townsend on US 287 near Toston. Construction begins one mile north of the existing bridges and ends just past Radersburg Road (Secondary 285) on the south end. This route is important for residents, agriculture, freight, and recreation. It is also popular for tourists traveling between Yellowstone and Glacier National Parks.

The Toston project improves safety and addresses current and future traffic needs. The existing roadway and bridges are over 70 years old and no longer meet transportation design, environment, or safety standards. In a recent 5-year study, this stretch of road has had higher crash frequency and more severe crashes than similar roads.

The project includes construction of 3.5 miles of new roadway, some of which will be moved over to connect to the new bridges over the Missouri River and BNSF railroad tracks. The two new bridges will be wider than the existing ones and will also include more room on the shoulder for walkers and bicyclists.

Construction also includes a new culvert at Six Mile Creek, a tunnel for pedestrians under the new bridge structure, a school bus turnout (off Radersburg Road), installation of wildlife fencing, and intersection improvements. After the new roadway and bridges are completed, the old roadway and bridges will be removed. Construction is expected to take two seasons (2019 and 2020) and to be completed in the spring of 2021.

Toston Structures project location map
Toston Structures Project Map
Click on the image to print, save or view the PDF


The Department welcomes your comments on the Toston Structures project.
Please feel free to submit comments:

  • Online:
    Fill out the Comment Form.
  • Mail:
    Montana Department of Transportation
    PO Box 201001
    Helena MT 59620-1001

Indicate comments are for project CN 7668.

Toston Structures Project construction hotline image