Project Overview

The Montana Department of Transportation (MDT) and its partner, Kiewit, are planning to begin construction on the MT 200 Bridges Lewistown Area project in April of 2025, depending on weather and other unforeseen factors.

This project will reconstruct 10 bridges along US 87/MT 200 in the Lewistown area, replacing the aging structures with new bridges or culverts. Nine of the bridges were constructed prior to 1940 and the timber structures are reaching the end of their useful and serviceable life. In addition to the bridge replacements, the project will include:

• Minor road and approach construction to tie the new structures into the existing road.
• Widening an approach for mail route turn-around (bridge #5993).
• Flattening the Briggs Coulee curve (bridge #6005).
• Flattening the roadway profile and installing lighted wildlife signage at Elk Creek (bridge #6101).
• Upgrading the Ayers irrigation ditch.
• Improving flood conditions at North Fork McDonald Creek (bridge #5994).
• Reconstructing nearly three miles of roadway adjacent to bridges.
• Widening shoulders near the bridges.
• Installing new guardrail.
• Installing rumble strips.
• Fencing improvements.

Construction is expected to continue through 2026; weather and other unforeseen factors permitting.

Motorists can expect reduced speeds, detours, alternating traffic, single lane traffic at times, and possible delays when travelling through the project area. Traffic control may vary at each project site.

Project Map

UPN 9884000