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Project Overview

Through Huntley Area Projects, the Montana Department of Transportation (MDT) plans to replace the deteriorating bridge over Twelve Mile Creek and make necessary roadway and safety improvements along Old Highway 312 (HWY 312), near Huntley. The new bridge will provide capacity for current and future traffic needs, and the roadway improvements will help address safety concerns.

The proposed project will be completed in two phases:

  • Phase 1 (anticipated letting 2027): West of Huntley and Twelve Mile Creek bridge.
  • Phase 2 (anticipated letting 2028): East of Huntley.

Project Map (all phases)

All phases map

Phase 1 Construction is anticipated in 2027 and includes roadway improvements on HWY 312 from the west end of the Twelve Mile Creek bridge to the intersection with Shepherd Road. Proposed improvements include:

  • Replacing the Twelve Mile Creek bridge
  • Constructing a two-way left turn lane on HWY 312 and widening shoulders between the Twelve Mile Creek bridge and the existing turn lane at Shepherd Road
  • Resurfacing the existing road to blend in with the new turn lane and wider shoulders
  • Replacing culverts
  • Applying a seal and cover (chip seal) to the roadway
  • Installing new signage, pavement markings, and shoulder rumble strips

Phase 1 Map:

Phase 1 map

Phase 2 Construction is anticipated in 2028 and includes roadway improvements on HWY 312 from the east end of the Yellowstone River bridge to the intersection with North 8th Road. Proposed improvements include:

  • Widening roadway shoulders and flattening slopes
  • Resurfacing the existing road to tie into the new improvements
  • Installing new shoulder and centerline rumble strips*

*Design is still in progress; proposed improvements may change as the project develops.

Phase 2 Map:

Phase 2 map

UPNs: 9719000, 9600000, and 9598000