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SR 150 - 3 Miles East of Manson - Slope Stabilization - Complete May 2011

Complete May 26, 2011
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The orange dot shows where the quarter-mile long section with three unstable slopes is located between MP 3.34 and 3.57 along SR 150, east of Manson on the north shore of Lake Chelan.

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This is the quarter-mile section of SR 150, east of Manson, where 3 rock slopes were stabilized.

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Before - looking west at the unstable slope at MP 3.6

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  Before - looking west at the unstable slope at MP 3.5

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A sand blanket was placed on the inside lane to reduce pavement damage during the first week's work - rock scaling.

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Rock scaling on Mar. 10 brought down some boulders.


Complete May 2011

Work began Feb. 28 and was complete May 26, 2011. 

This Preservation Program project stabilizes three rock slopes.  Locally known as "Rocky Point", it is on the north side of the highway three miles east of Manson.

Why is WSDOT Stabilizing these slopes?
They were identified for stabilization under the WSDOT Unstable Slope Management Program.  The slopes were evaluated, rated and analyzed for cost vs. benefit in 2004 and failed to qualify for funding, but when the slopes were reevaluated in 2008, slope conditions had deteriorated and they were funded for construction in the next budget cycle.
A minimum rating of 350 and a cost/benefit of 1.0 is necessary for funding.  These slopes were rated from 405 to 477 with c/b's from 4.36 to 6.59

The WSDOT Geotechnical engineers recommended:

  • Removing loose rocks and debris from the slopes.
  • Installation of rock bolts to secure larger rock formations that cannot be removed.
  • Installation of steel netting to contain any rock that does fall, from reaching the roadway.

The End Result
The risk of rocks falling onto SR 150 is reduced between Manson and Chelan.

Project Benefits

  • Reduced risk of rockfall-caused collisions.
  • Reduced maintenance costs, cleaning up fallen rocks
  • Reduced pavement repair costs.

What is the project timeline?
Work began Feb. 28 and was complete May 26, 2011.

Financial Information

Project signage will reflect the cost of construction engineering, project bid award and sales tax.

The project was advertised for private contractor bids Nov. 22, 2010. Six qualified bids were opened Dec. 16. On Dec. 20, contract #8056 was awarded to HI TECH Rockfall Construction, Inc. for $1,377,777.00, 15% 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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