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US 2 - West of Leavenworth - Slope Stabilization - Complete November 2011

Complete Nov. 15, 2011
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This project stabilized two slopes in Tumwater Canyon at MP 91.2-5 and 94.2-5 west of Leavenworth on US 2 in Chelan County.

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Before stabilization.

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This rock fell onto the highway three miles east of this project in Jan. 2010.

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Cranes are used to drape the steel netting on the slopes after the scaling and rock bolting.


Complete-November 2011

Construction began July 5 and was complete Nov.15.

This Preservation Program project stabilized two rock slopes above US 2, five miles west of Leavenworth in Tumwater Canyon.

Why is WSDOT stabilize these slopes?
These rock slopes were identified for stabilization in the WSDOT Unstable Slope Management Program. Our Geotechnical staff evaluate such factors as catchment area, frequency of slope failures (rock fall incidents), and how often the driving lanes were impeded.

Stabilization techniques included scaling rocks from the slopes, installing rock bolts, installing steel netting as well as tree and debris removal.

The End Result
This project reduces the potential for falling rocks and trees creating a hazard on the roadway.

Project Benefits

  • This project increases the stability of the rock slopes.
  • Less rockfall clean up and fewer pavement repairs reduces maintenance costs.
  • Widened ditches increases snow storage and keeps rocks and debris from reaching the roadway.

What is the project timeline?
Construction began July 5 and was complete Nov. 15.

Financial Information

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

This project was advertised for private contractor bids March 28, 2011. Six bids were opened on April 28 and contract #8122 was awarded to Rock & Co, dba Ock Ray on May 2 for $1,415,245.00, 38% under the engineering estimate.

The project was funded through the following sources:

  • Pre-existing Gas Tax - $2.5 million
  • Total Funding from all sources - $2.5 million

How can I get more information?
Project Engineer, Josh Patrick
WSDOT North Central Region
P.O. Box 98
Wenatchee, WA 98807
Phone: (509) 667-2870 or toll free (888) 461-8816
e mail:

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