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.

These two corridors were evaluated in more detail through an Alternatives Analysis, Risk Assessment Workshop, and a Value Engineering review. Based on this evaluation and public input, an alignment in the central corridor is being advanced to detailed design.

Toston Structures project location map

US 287 is an important state highway connecting Interstate 90 at Three Forks to Helena, Montana, and surrounding communities. This segment of highway 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.