Two separate, yet highly anticipated construction projects in Grays Harbor County are underway in both Montesano and Cosmopolis less than eight miles from each other and will last through fall of 2020.

SR 107 Chehalis River Bridge structural rehabilitation

Beginning Monday, April 29, Rognlin’s, Inc. crews working for the Washington State Department of Transportation began efforts to rehabilitate the 58-year-old State Route 107 Chehalis River Bridge located just south of Montesano. Crews will replace the timber on the south approach of the bridge, install modern safety rails, and paint the bridge’s steel structure.

US 101 slope stabilization

Slightly west, a section of US 101 also known as Cosi Hill, is the site of a large, slow-moving landslide under the highway. Despite ongoing maintenance efforts, more work is necessary to repair the slide-prone area. Crews will drill six-foot diameter columns nearly 50 feet deep and fill them with rock to stabilize this stretch of highway. About 600 shafts will form a buttress to support the highway while addressing ongoing drainage concerns. Construction is anticipated to begin in June.

“We know these are two projects the community is eager for us to address,” said WSDOT Project Engineer John Romero who is overseeing both construction contracts. “We are ready to get to work and appreciate the public’s patience – especially those traveling to and from Pacific Ocean beaches during the summer months.”

Speed limit reductions

On Monday, April 29 the speed limit was reduced from 40 mph to 25 mph through the work zone for the SR 107 Chehalis River bridge rehabilitation. A reduced speed limit of 25 mph is already in place at Cosi Hill. The 25 mph speed limit will remain in place at both locations until work is completed in fall 2020.

What to expect during construction

In addition to speed limit reductions during the two-year construction projects, travelers can expect:

  • One-way alternating traffic with a temporary signal in the SR 107 work zone.
  • Narrowed and shifted lanes on US 101, with up to a five-day highway closure. Traffic will follow a signed detour via Blue Slough Road. The date for the highway closure will be announced later this summer.
  • SR 107 oversized and overweight vehicles may need to use another route. Please contact Commercial Vehicle Services to determine if an alternate route is necessary.

WSDOT will work to keep traffic moving. Travelers are encouraged to sign up for email alerts about this work and other Grays Harbor County maintenance and construction activities on state highways. Real time traffic information is available on the WSDOT mobile app or Twitter.

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