North Central Region Chip Seal 2014 - Complete September 2014

Construction began March 17 and was complete in September.
This P1 Roadway Preservation project chip sealed 238 miles on 10 highways in Adams, Chelan, Douglas, Grant, and Okanogan Counties.
The project preserved the integrity and life of deteriorating roadway by applying a Bituminous Surface Treatment (BST) seal coat of oil and gravel to the existing pavement. Restoration was necessary before the underlying road structure was damaged, requiring a much more expensive rebuild.
This was the largest Seal project ever in the North Central Region.

How you benefit

Improves safety
The highways in the North Central Region are subject to 100 degree + temperatures in the summer and below zero temperatures in the winter. BST seals not only provide a waterproof surface, but a flexible one that resists cracking under these conditions.
The project also updated safety features including new striping, centerline rumble strips and reflective pavement markers.

Economic incentive
A BST seal lasts an average of six years at a cost of about $40,000 per mile, while a Hot Mix Asphalt surface lasts about 13 years and costs $260,000 per mile.


Partnerships & Cooperation
Along with paving several intersections, the project addressed ADA (Americans with Disability Act) concerns on SR 155 in Grand Coulee and US 97 in the City of Tonasket.


This project was advertised for private contractor bids on Dec. 2. Three qualified bids were opened on Jan. 9. On Jan. 13, 2014, contract #8566 awarded to Central Washington Asphalt for $15,496,657.95, 1.5% over the engineering estimate.

Contact us
Project Engineer: Chad Simonson
WSDOT Eastern Region
2714 N. Mayfair Street
Spokane, WA 99207
phone 509.324.6252