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US 2 - Stevens Pass West - Unstable Slopes.

Complete 09/19/14
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 The project stabilized 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 was step one in the stabilization effort.

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

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

Cable Net - click to enlarge
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  The final step was hanging the steel cable netting over the stabilized slope.


Status

 
Complete September 2014

Season 3 construction on the last slope began July 9 and was complete September 19.

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

Season 1 construction began May 9, 2012 and continued to November 1. 

Season 2 construction began May 13 to Nov. 1, 2013.

This P3 Unstable Slopes Preservation Program project stabilized 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, included 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 was designed to reduce the potential for rockfall hazards on the roadway.

Project Benefits

  • Reduced potential for rockfall onto US 2.
  • Reduced maintenance costs.
  • Reduced potential road closures as well.

What is the project timeline?
Construction started May 9, 2012.  The work was scheduled for 250 working days, extending over three construction seasons, ending September 19, 2014

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 was 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?
Contact:
Kevin Waligorski Project Engineer
WSDOT North Central Region
2830 Euclid Ave
Wenatchee, WA 98807
Phone: (509) 667-2860 or toll free (888) 461-8816
E-mail: waligok@wsdot.wa.gov

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