I-90 Two-Way Transit & HOV Operations Stage 3

Project Summary

IMCO General Construction began work in early 2015 on this federally funded highway project in Seattle, Washington valued at over $120 Million. The entire I-90 Two-Way Transit and HOV Operations Project is a $220 Million project being administered by the Washington State Department of Transportation (WSDOT). The project is being funded by WSDOT, Sound Transit, and the Federal Transit Administration. It will bring significant improvements to regional mobility as it is adding HOV lanes and direct-access ramps for transit and HOVs on Mercer Island and in Bellevue. A major component is infrastructure needed to build the Sound Transit East Link light rail extension from Seattle to Mercer Island, Bellevue, and Redmond.

The project is being implemented in stages due to timing and availability of funding. The first phase was completed in 2008 and the second phase was completed in 2012. The third and final phase was partially funded by a federal TIGER Grant, the US Department of Transportation’s Investment Generating Economic Recovery grant program.

IMCO General Construction was prequalified to bid this project in September 2014, submitted a bid electronically on October 29th, and was the lowest of four bidders. IMCO will oversee construction that prepares the I-90 tunnels for the Sound Transit light rail to pass through them starting in 2020. Work includes adding an HOV lane in each direction between Mercer Island and Seattle, and preserving pavement in both directions, from I-5 across Lake Washington to Bellevue. The project builds an eastbound HOV direct-access exit ramp at Island Crest Way on Mercer Island and upgrades the I-90 tunnels’ fire and life safety systems. This project will include lane closures and weekend closures in both directions throughout the project. All closures will be planned for in advance and scheduled through WSDOT and local officials to ensure proper notice is given to the traveling public. Construction started the end of February 2015 with a weekend closure of eastbound I-90 over Lake Washington. The project will be complete on June 1st, 2017 in time to start construction on the East Link light rail across the lake.



Seattle, WA



Contract Amount

$120 Million