Local Information

Bridge deck repair work to temporarily lengthen one-lane section of westbound SR 18

Friday, May 3, 2019 - 08:48

Nicole Daniels, communications, 206-440-4479
Mike Askarian, project engineer, 206-768-5861

Two months of around-the-clock traffic changes near Issaquah-Hobart Road begin Monday, May 13

HOBART – The rough and bumpy ride across the westbound State Route 18 overpass at Issaquah-Hobart Road will soon be a distant memory. But in order to complete the work, travelers should plan ahead for around-the-clock delays beginning at 5 a.m. Monday, May 13.

Washington State Department of Transportation contractor crews from Tucci & Sons Inc. will extend the one-lane section of westbound SR 18 by about a half-mile, across the Issaquah-Hobart Road overpass. This temporary configuration will remain in place around-the-clock for approximately 65 days while crews repair and repave the bridge deck. When the work is complete in mid-July, the highway will return to its regular two-lane westbound configuration.

“This bridge was last paved in 1989, so weather and heavy traffic have worn down the driving surface, causing pothole repair patches that range from a few inches to several feet in size,” said Project Engineer Mike Askarian. “Repaving the overpass will preserve the structure and provide a smoother ride for the 12,000 vehicles who use this stretch of highway each day.”

Work plan

Contractor crews will work in one lane at a time. They will first grind off the old concrete in the right lane, make any needed repairs to the bridge deck and repave it. When that is complete, they’ll shift traffic onto the new pavement and repeat the process in the left lane.

The speed limit will also be reduced to 50 mph during this work, and oversized vehicles will be prohibited from traveling in the westbound direction across the bridge.

Overnight full closures

The project will require up to eight overnight full closures of westbound SR 18 so crews can safely set temporary barriers and pour new concrete. During these closures, travelers will use the Issaquah-Hobart Road off- and on-ramps to bypass the work zone, with a uniformed police officer directing traffic at the intersection.

In addition to the overpass paving, contractor crews will continue work to repave more than four miles of eastbound SR 18 between Southeast 304th Street in Auburn and Southeast 256th Street in Covington. The total cost of this project is $4.4 million and is scheduled to be complete in fall 2019.

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