Montana Department of Transportation

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West Bozeman Interchange Bridge Project

West Bozeman Interchange Bridge Project

Project Overview

Bozeman bridge and craneConstruction to replace the dual bridges at the West Bozeman Interchange began in March 2013. This important project will address structural vulnerabilities during earthquakes and to improve traffic capacity and function. The West Bozeman Interchange carries North 7th Avenue traffic over Interstate 90 and provides ramp access to eastbound and westbound I90. The existing bridges will be replaced with one new structure that will include four driving lanes, two left hand turn lanes onto the I90 westbound on-ramp, 5 foot shoulders that can accommodate bicycle traffic, and 5 foot sidewalks that are ADA accessible. Additionally, the westbound on-ramp will be widened to accommodate two lanes. Other improvements will include new luminaires, traffic signing and signals.

The interchange bridge construction will be completed in two phases. Phase 1 will consist of removing the northbound structure (east bridge) crossing I90 and accommodating two lanes of North 7th Avenue traffic on the existing southbound structure while half of the new bridge is being built.

Phase 2 will consist of shifting traffic to the new half of the structure which will accommodate three lanes of North 7th Avenue traffic while the existing southbound structure (west bridge) is removed and replaced with the other half of the new structure. To accommodate potential traffic delays on North 7th Avenue, a temporary traffic signal and lane modifications will be established at the Oak Street intersection.

Impact to I90 traffic will consist of crossovers and lane reductions to accommodate construction activities when needed. Information regarding traffic advisories will be posted on this website, in the local newspaper and on local radio stations as well as the Highway Advisory Radio.

Project construction began in March 2013 and will continue into 2014.