This section of SR 20 had been identified as having a high number of injury-producing collisions involving vehicles leaving the roadway. Construction started May 11 and was complete July 31, 2009. This Collision Prevention-Safety Improvement project installed guardrail where needed and removed roadside hazards along SR 20 between Mazama and the Aeneas Valley, east of Tonasket in Okanogan County. The NCR Seal 2009 project was consolidated with this one to reduce costs, improve efficiencies and reduce traffic impacts during construction.
By reducing the severity of off-road collisions, providing more protection from roadside hazards and steep shoulders with removal of hazards and installation of new guardrail.
Partnerships & Cooperation
Colville Tribal monitoring was in place throughout construction. No impacts were identified.
This project was advertised for private contractor bids December 15th, 2008. Two qualified bids were opened January 15th, 2009 and on January 20th contract #7654 was awarded to Central Washington Asphalt, Inc. for $5,732,952.50, $400,000 (6%) under the engineering estimate.
This project was funded through the following sources:
· Pre-Existing Gas Tax - $6.3 million
· Transportation Improvement Board - $0.2 million
· 2005 TPA Funding - $0.9
· Total Funding from all sources - $7.4 million
Project Engineer Ken Olson
WSDOT Eastern Region Project Office
2714 North Mayfair St.
Spokane, WA 99207-2090
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