US 191 – Mobridge Slide Repairs logo

Project Overview

The Montana Department of Transportation (MDT) is partnering with M.A. Deatley Construction, Inc. to reconstruct sections of US Highway 191 (US 191) near the James Kipp Recreation Area and the Missouri River bridge. The US 191 – Mobridge Slide Repairs project will help stabilize a section of roadway that was damaged from landslides in the area.

The project area includes three different locations along US 191 which will be completed in two phases. The first phase will include work at Site A (see map below), which is the largest area and impacts the section of road between mile markers 84 and 85. This slide has been an issue since the late 1950s but has worsened over the last decade.

Phase 1 improvements (site A) will include:

  • Reconstructing embankments to mitigate landslide movements.
  • Improving the grading of the roadway.
  • Constructing a new roadway surface.
  • Improving drainage.
  • Upgrading safety features such as new guardrail, signage, and pavement markings.

Construction is anticipated to begin in 2025.

Phase 2 of construction will involve work on additional landslide locations between mile markers 85 and 86 (Site B), north of the Mobridge Slide and near mile marker 89 (Site C), just north of the Missouri River.

Phase 2 improvements (Site A and Site B) will include:

  • Final construction at Site A (jack-and-bore culvert and final pavement installation).
  • Reconstructing the soil structures supporting the roadway to prevent further deterioration of the roadway.
  • Improving drainage features to reduce infiltration of surface water on the roadway.

Phase 2 improvements (Site C) will include:

  • Widening the roadway.
  • Repairing the roadway to address bumps and settlements caused by landslide (heaving).

Phase 2 construction is anticipated to begin in 2027, depending on completion of design and availability of funding.

Project Map

US 191 – Mobridge Slide Repairs map

Click on the image for a larger view

Traffic control will be in place when construction begins. Motorists can expect reduced speeds, single-lane closures, alternating traffic and possible delays when travelling through the project area.

M.A. DeAtley Construction logo

UPN: 9919000