I-90, Adams County Line to Spokane County Line
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Lincoln County
This project is located on Interstate 90 within Lincoln County from six miles west of Sprague, WA to 10 miles east of Sprague. We repaved the outside lanes of the freeway to fix damage due to aging and ruts, and updated safety features to current standards.
Crews ground out most of the existing asphalt surface from the right-hand driving lanes, then repaved with new asphalt. They also sealed cracks in the shoulders and gave interchange ramps a coating of liquid asphalt to prevent water from seeping below the roadway surface. This method of rehabilitating the driving surface is more cost-effective than resurfacing the entire roadway. The asphalt layer provides a smoother driving surface and extends the service life of the roadway by approximately 12 years.
In addition, our contractor addressed some safety issues for this section of freeway. These items include removing some rock formations from within the “clear zone.” The clear zone provides an area, free of fixed objects, where a driver who has run off the roadway can recover control of the vehicle.
Another component in the project is resurfacing work at the Sprague Lake rest areas. In addition to the on and off ramp resurfacing, the rest area parking lots were sealed. This protects the existing pavement and extends the life of the surface.
Construction Summary
We built this project according to original plans, with a few small adjustments. One change required the bridge joints at the SR 23 Interchange to be resurfaced due to deeper ruts than anticipated. This added approximately $25,000 and six days to the contract. Other minor changes included additional adjustments to existing illumination systems, signing, addition of traffic safety drums, adding sagebrush seed to the seeding specification and adding fencing to the WSDOT quarry site. These were minor cost change orders and no additional working days were added.
Our working relationship with the contractor was good. Weekly meetings were held and issues were resolved quickly.
Six days were added to the contract to reconstruct rutted concrete bridge joints. During the design of the project, the depth of the ruts at the bridge joints was overlooked, which necessitated the change order.
The expected final contractor payment will be about $3,250,000. This is 4 percent under the bid amount.
Contractor
Inland Asphalt Company,
Spokane Valley, WA
WSDOT Contact
Ken Olson, Project Engineer
(509)324-6141
olsonk@wsdot.wa.gov
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