Montana Department of Transportation

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Public Involvement

Underpass Ave - Billings

Underpass Ave Project Logo Underpass Ave image

Project Overview

Design is nearing completion on the Underpass Avenue/State Avenue and the 6th Street West/Central Avenue intersections. This project will improve traffic operations and safety concerns for this main traffic corridor in the South Billings area. The purpose of this project will be to reconstruct the intersections to improve capacity and operations, install an adequate drainage system to keep the underpass location from flooding, and provide additional pedestrian and bicycle accommodations while considering the urban nature of the area. Construction is tentatively scheduled for summer 2022.

The newly-designed project incorporates new traffic signals, storm drain, lighting, improved pedestrian and bicycle facilities, and upgraded signing to enhance these intersections, promote accessibility, and improve safety. After much review and public participation, the following improvements are planned to both fulfill traffic and pedestrian needs and community desires.

Underpass Avenue/State Avenue Intersection Improvements:

  • Dual southbound left turn lanes from 6th Street West for morning traffic
  • Additional lanes on Underpass Avenue
  • Additional pedestrian improvements
  • Relocated pump house and new storm drain inlets
  • New traffic signal and lighting
  • Lighting under the MRL bridge for pedestrians/bicyclists

Underpass Ave heading

6th Street West/Central Avenue Intersection Improvements:

  • Dual northbound left turn lanes from 6th Street West for evening traffic
  • New traffic signal and lighting
  • Additional pedestrian improvements

Underpass Ave 6th ts heading

Other Project Improvements:

  • Detention ponds for stormwater
  • Full lane from Laurel Road westbound ramp to Moore Lane
  • Connection to recent City of Billings project at Calhoun Lane
  • The project team is also coordinating with the South Side Neighborhood Task Force on the “Rise and Shine: A Mural for the Community” project funded through a recent Big Sky Economic Development Space2Place grant. The mural is planned along the sidewalk in the underpass.

MDT is funding this project through the Congestion Mitigation and Air Quality Program, a flexible funding source to state and local governments for transportation projects and programs to help meet the requirements of the Clean Air Act. MDT has taken advantage of this flexibility by developing the Montana Air and Congestion Initiative (MACI) Program, which provides funding for projects and programs that reduce transportation-related emissions.