Montana Department of Transportation

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Toston Structures Project


US 287 near Toston

The Toston Structures project is located on US 287 near Toston, between Reference Posts 85.9 and 89.3, in Broadwater County, Montana. This project involves roadway reconstruction and replacement of three structures: the Six Mile Creek crossing at RP 87.22, the MRL Bridge at RP 88.0, and the Missouri River Bridge at RP 88.3. This area was previously evaluated in corridor planning study, which recommended two corridor paths for further consideration: a central corridor path and an eastern corridor path, as shown in the figure below. Phase I of the project will evaluate these two corridors and determine a single alignment to advance to detailed design.

Toston Structures project location map

US 287 is an important state highway connecting Three Forks and Interstate 90 to Helena, Montana, and surrounding communities. The corridor has higher crash and crash severity rates than the statewide average and does not meet current design standards.

This project is intended to upgrade the existing sub-standard horizontal and vertical alignments to current standards, as well as provide a roadway that accommodates existing and future traffic demands for the diverse nature of traffic on the corridor.