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US 2 - Chiwaukum Creek - Complete November 2013

November 2013
Click to enlarge View entire map  This TPA project is replacing the old, narrow bridge over Chiwaukum Creek, just above Tumwater Canyon (MP 89.88-89.91), ten miles west of Leavenworth in Chelan County.

Click to enlarge View entire photo -2011-Before-The new bridge will be wider and carry more weight.

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-2011-Before-A closer view, looking north at the south side of the bridge.

Aug.2012 - New Bridge, from the old bridge
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- 2012-During Construction in late August-The new bridge, looking south from the old bridge.
Bridge-View East-Fall 2012
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- 2012 - late fall - the new bridge from the new alignment looking east.


Complete November 2013

Season 1 construction began August 1, 2011 and was shut down for winter on Nov. 30.
Season 2 construction began in April, 2012 and was shut down for winter on Nov. 30. 
Season 3 construction resumed April 8, 2013 and was complete in November.

This project, under the name US 2 – Tumwater Canyon Bridge Replacements, includes two other bridges: The Green Bridge, which is located 3/4 of a mile to the east at the top of the Canyon and the Drury Creek Bridge, two miles further east.

The project also includes an Additional Turn Lanes project at the Tumwater Campground.
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This Catastrophic Reduction Structure Preservation project replaces an old bridge on US 2 just above Tumwater Canyon, ten miles west of Leavenworth in Chelan County.

Why is WSDOT replacing the Chiwaukum Creek Bridge?

The current steel girder structure is functionally obsolete, which means it doesn't meet today's design standards for traffic loads (weight) and roadway width.  Originally built in 1936, the bridge has undergone various retrofits to improve the deteriorated concrete bridge rails and also to try to reduce undermining of the footings from Chiwaukum Creek due to scour. (Washing out the soil under the footings).  The age and design of the bridge requires regular maintenance and doesn't allow for widening so replacement is the only option. 

The End Result
The new structure includes two 12-foot lanes with 8-foot shoulders. (Currently - two 12-foot lanes with no shoulders.)  The new structure also spans Chiwaukum Creek 300 feet south of the current US 2 alignment, requiring construction of 1-mile of new roadway connecting to it. This reduces impacts to the environmentally sensitive section of the stream where the current bridge is located. The design of the new bridge also reduces the need to clear debris (logs jams, etc.) from the bridge footings eliminating the undermining of the bridge piers due to scour from high water events. 

Project Benefits

  • Very little traffic impact during construction as the current bridge and highway alignment remains in use while the new work proceeds off road to the south.
  • Provides a wider bridge with shoulders to accommodate emergency parking/recovery zone.
  • Oversize vehicle loads will be better accommodated with a stronger and wider bridge deck.
  • Two 8-foot shoulders better accommodate bicycles and pedestrians.
  • Reconfiguring the creek crossing and the new bridge's design will reduce debris accumulation.
  • Replacing the old steel girder bridge with a concrete girder structure, eliminates the need to paint it on a regular basis.
  • Fish passage enhancements to the creek bed are also included.

What is the project timeline?
Construction started August 1, 2011 and was completed in November 2013.

Financial Information

Financial Data for PIN 200201L
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $406
Pre-Existing Funds (PEF) $5,851
CWA $0
Total $6,257

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

This project, under the name US 2 – Tumwater Canyon Bridge Replacements, includes two other bridges at the top of Tumwater Canyon (the green bridge) and Drury Creek, as well as new turn lanes into Tumwater Campground.

How can I get more information?
Bob Romine, Project Engineer
WSDOT North Central Region
P.O. Box 98
Wenatchee, WA 98807
Phone:  (509) 667-2880 or toll free (888) 461-8816

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