Project Complete March 2011
Work on this project resumed Feb. 22 and was complete Mar. 3, 2011
This Preservation Program project stabilized three rock slopes in a one mile section above US 97A, four miles north of Wenatchee between Rocky Reach Dam and Swakane Canyon.
Why is WSDOT
Stabilizing These Slopes?
This project will reduce the potential for rocks to fall onto US 97A between Wenatchee and Entiat.
Three hazardous slopes were identified for stabilization by the WSDOT Unstable Slope Management Program. The slopes were evaluated, rated and analyzed for cost vs. benefit in 2006 and were funded for stabilization in the current budget. Usually a rating of 350, a cost/benefit of 1.0 and an average daily traffic count of 5,000 is necessary for funding. The average daily traffic count below these slopes is 6,000 per day. Two slopes rated 405 with c/b's of 1.08 to 1.78. The third slope was rated slightly lower (333) with a cost/benefit of .80, but due to its proximity to the other slopes and the economies of scale to address all 3 in one project, it was included as well.
To restore the integrity of these slopes these measures were recommended:
- Debris removal
- Rock scaling
- Installation of rock bolts
- Installation of steel cable netting
The End Result
Fewer falling rocks should reach the roadway, reducing the potential for damage to vehicles and pavement.
Reduced rock fall is the primary benefit, but it also reduces maintenance costs cleaning up fallen rocks as well as avoiding costly repairs to the roadway.
What is the project timeline?
Construction started Feb. 22, 2010 and was complete Mar. 3, 2011.
Project signage will reflect the cost of construction engineering, project bid award and sales tax.
|Financial Data for PIN 209790C
||Amount ($ in thousands)
|2003 Gas Tax (Nickel Funding)
|2005 Gas Tax (TPA)
|Pre-Existing Funds (PEF)
On Oct. 1, 2009, four qualified bids were opened and on Oct. 5, Contract #7819 was awarded to HI TECH Rockfall Construction, Inc. for $3,664,568.94, 28% below the engineering estimate.
How can I get more information?
Project Engineer,Bob Romine
WSDOT North Central Region Project Office
PO Box 98
Wenatchee, WA 98807
Phone: 509-667-2880, or toll-free 1-888-461-8816
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