Underpass Avenue logo

Project Overview

MDT partnered with Riverside Contracting Inc. to reconstruct the Underpass Avenue with State Avenue intersection, and the 6th Street West with Central Avenue intersection. The project aimed to improve traffic operations in south-central Billings by:

  • Widening the State Avenue with Underpass Avenue intersection.
  • Upgrading the stormwater system to address previous flooding issues.
  • Adding travel lanes.
  • Improving pedestrian and Americans with Disabilities Act (ADA) facilities.
  • Installing new lighting and signage.

Construction on the Underpass Avenue - Billings project began in the spring of 2023 and wrapped in the summer of 2024.

Construction camera: View real-time images of current traffic conditions

A map with red X's north and south of the 6th Street West underpass illustrating the closure with alternate route options shown in green.

Project Objectives

Underpass Avenue and State Avenue Intersection Improvements:

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

6th Street West and Central Avenue Intersection Improvements:

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

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.
  • Preservation of recent community murals in the underpass.
Riverside logo

UPN 8669001