Montana Department of Transportation

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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 addressed structural vulnerabilities during earthquakes and improved 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 were 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 to accommodate bicycle traffic, and 5 foot sidewalks that are ADA accessible. Additionally, the westbound on-ramp was widened to accommodate two lanes. Other improvements included new luminaires, traffic signing and signals.

The interchange bridge construction was completed in two phases. Phase 1 consisted 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 consisted of shifting traffic to the new half of the structure to accommodate three lanes of North 7th Avenue traffic while the existing southbound structure (west bridge) was 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.

Project construction began in March 2013 and completed in 2014.

Bozeman Interchange

Interchange Bridge Opens Seven Months Ahead of Schedule