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Project Overview

The Montana Department of Transportation (MDT), in partnership with engineering firm Sanbell, has begun the design phase of an improvement project to enhance safety features and accessibility at the intersection of Mill Street and Rabel Lane with U.S. Highway 191 (US 191)/Gallatin Road in Gallatin Gateway.

A new traffic signal will be installed to help address intersection-related crashes and operational concerns. Other improvements include adding sidewalks and sidewalk ramps that meet current Americans with Disabilities Act (ADA) standards.

Planned improvements include:

  • Installing a new traffic signal at the intersection of Mill Street and Rabel Lane with US 191/Gallatin Road.
  • Installing LED lighting at the intersection.
  • Widening Mill Street on the west side of the intersection to include a left turn lane.
  • Installing new ADA-compliant sidewalk ramps at the corners of Rabel Lane and US 191/Gallatin Road.
  • Adding a new pedestrian path along the north side of Mill Street from the underpass trail to the existing school crossing.
Map of the Mill Street and U.S. Highway 191(US 191) intersection in Gallatin Gateway, Montana, highlighting the project area for planned intersection improvements. The map is oriented with north at the top and includes a compass rose for reference. US 191, labeled Gallatin Road, runs north–south through the center-right of the map. Mill Street runs east–west and intersects US 191 near the center of the map. The project area is highlighted in orange along a short segment of Mill Street approaching and crossing US 191. Rabel Lane intersects Mill Street just east of US 191. Nearby streets include Bench Street north of Mill Street, Bozeman Street farther north, Webb Street to the west, Latigo Drive to the northeast, Davenport Street to the southeast, and Hargrove Loop south of Mill Street. Key nearby landmarks shown on the map include Gallatin Gateway School southwest of the intersection, the Gallatin Gateway Community Center northwest of the intersection along Bench Street, Big Timberworks Inc. northeast of the intersection, and the United States Postal Service southeast of the intersection along Rabel Lane. A legend indicates the orange shading represents the project area.
Project map showing the Mill Street and U.S. Highway 191 intersection improvement area in Gallatin Gateway, Montana. The highlighted segment along Mill Street identifies the limits of the proposed improvements.

Tentative Timeline

Updated on August 17, 2026
The project is currently in the design phase. Construction is tentatively scheduled for 2027. This timeline is dependent on completion of design, project scheduling, funding availability, and unforeseen factors.

Community feedback is incredibly important to the success of this project. The public is encouraged to reach out with thoughts and questions by calling the project hotline at 406-207-4484, operating Monday through Friday from 9 a.m. to 5 p.m., or by emailing sloaneXYZbigskypublicrelationsABCcom.

Email updates will be provided at project milestones. To subscribe to updates, please email Sloane Stinson.

Project Funding

The Mill Street Intersection Improvements project is being funded through the Highway Safety Improvement Program (HSIP). The primary focus of the program is to identify locations where higher-severity crashes have occurred and prioritize work to reduce them.

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UPN 1029100