Montana Department of Transportation rendering

A map of the area impacted by U.S. 191 — Mobridge Slide Repairs project.

The Montana Department of Transportation (MDT) and its partner M.A. DeAtley Construction Inc., have begun the preliminary site work, dirt work and staging on the U.S. 191 — Mobridge Slide Repairs project.

This includes arranging and organizing the materials, equipment and recourses needed for the project. The initial site work is expected to be completed in the coming months; full construction activities are expected to begin immediately after. Minimal traffic disruption is anticipated during the preliminary site work as much of the work will be off-site and not seen from the road.

This project will reconstruct and stabilize areas impacted by three landslides on U.S. 191 near the James Kipp Recreation Area and the Fred Robinson Bridge over the Missouri River.

The project area includes three different locations along corridor which will be completed in two phases. The first phase will include work at Site A, which is the largest area and impacts the section of road between mile markers 84 and 85. Construction is anticipated to continue into 2026.

Phase 1 project improvements will include:

• reconstructing embankments to mitigate landslide movements. This involves adding a toe berm and shear key at the base of the former landslide;

• improving drainage;

• improve the grading of the roadway;

• constructing a new roadway surface; and

• upgrading safety features such as new guardrail, signage and pavement markings

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

For more information, visit mdt.mt.gov/pubinvolve/mobridge.

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