WSDOT completed the second portion of this two-phase construction project to improve the I-90/SR 18 Interchange near Snoqualmie, about 20 miles east of Bellevue.
In phase one crews installed an interim signal where the off-ramp meets SR 18 and added a right turn lane by restriping the road.
In phase two crews installed a permanent signal, widened the off-ramp to add a second left turn lane, widened SR 18 under I-90 and added a northbound lane to Snoqualmie Parkway for about 1000 feet to the north of I-90.
The new signal will reduce the likelihood of collisions caused when traffic on the exit backs up onto eastbound I-90.
The combination of the new signal and the widened roadway will help vehicles move through the interchange more efficiently.
| Protects Environment
Crews constructed facilities to treat highway run-off, which will benefit salmon and other fish in nearby streams and rivers.
Partnerships & Cooperation
The Yakama, Tulalip, Muckleshoot, Snoqualmie, Duwamish and Kikiallus tribes were formally consulted as part of this project. They were each sent a copy of the Cultural Resource Survey for the project and asked to review and comment on it. The survey was then forwarded to the State Historic Preservation Officer who concurred with its findings and recommendations.
John Lefotu, WSDOT Project Engineer
6431 Corson Ave. South
Seattle, WA 98108
Greg Phipps, WSDOT Communications
15700 Dayton Avenue North
Seattle, WA 98133
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