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US 2 - Stevens Pass West - Unstable Slopes.

Start May 2012 - End Nov. 2014
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 The project stabilizes 4 slopes west of the summit. One is between MP 64.1 and MP 63.9, two, MP 63.2 to MP 63, three, MP 63 to MP 62.6, and the fourth is  from MP 61.25 to MP 60.90.

(MP 63 to MP 62.6)

Scaling - click to enlarge
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Scaling of loose rock is step one in the stabilization effort.

Debris - click to enlarge
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Cleaning up the debris brought down by the scaling is the second step.

Bolt Drilling - click to enlarge
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  Drilling and installing rock bolts is next.

Cable Net - click to enlarge
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  The final step is draping the stabilized slope with steel cable netting.


Summer 2014

Season 3 construction on the last slope is underway.

The project has stretched over three construction seasons due to the later start and early end to work at 4,000 feet of elevation in the Cascades.

Significant traffic impacts have not been required as the highway is four lanes wide through the entire section and even with two of them closed, two way traffic (one in each direction) has been maintained. Space for bikes is included.

Follow the progress and on the North Central Region’s Construction Update and Travel Advisory web page. 

Season 1 construction began May 9, 2012 and continued until winter shutdown on November 1. 

Season 2 construction began May 13 and was shut down for winter on Nov. 1, 2013.

Season 3 began July 9 and should end in September.

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This P3 Unstable Slopes Preservation Program project stabilizes four different rock slopes along US 2, in a three mile section from the Stevens Pass Summit, west.

Why is WSDOT stabilizing these slopes?

This project is to reduce the potential for loose rocks to roll down onto the roadway, creating driving hazards. 
Stabilization techniques recommended by WSDOT Geotechnical branch and our contract-consultants, Golder Associates, includes tree and debris removal, scaling of loose rocks from the slopes, installing rock bolts, installing steel cable netting and "shotcreting" select areas.

The End Result
This project is designed to reduce the potential for rockfall hazards on the roadway.

Project Benefits

  • Increasing the stability of these rock slopes is being done to reduce the potential for rockfall onto US 2.
  • Beyond improving the general safety to the public, reducing the amount of rockfall will reduce maintenance costs.
  • Reducing rockfall can prevent some road closures as well.

What is the project timeline?
Construction started May 9, 2012.  The work is scheduled for 250 working days, extending over 3 construction seasons (2012,13, & 14).

Financial Information

Financial Data for PIN 200200V
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $7,291
Total $7,291

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

This project was advertised for private contractor bids Nov 7, 2011. Six qualified bids were opened Dec. 22. On Dec. 29, Contract #8229 was awarded to MidWest Rockfall, Inc. for $5,291, 071.20, 15% below the engineering estimate.

The project is funded through the following sources:                                                              

  • Pre-existing Gas Tax - $9.97 million                         
  • Total Funding from all sources - $9.97 million

How can I get more information?
Kevin Waligorski Project Engineer
WSDOT North Central Region
2830 Euclid Ave
Wenatchee, WA 98807
Phone: (509) 667-2860 or toll free (888) 461-8816

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