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.
View entire photo The new bridge will carry more weight and be much wider.
View entire photo A closer view, looking north at the south side of the bridge.
Winter 2013
Construction began Aug. 1, 2011 and was shut down for winter on Nov. 30 and resumed in April, 2012. Work was again shut down for winter Oct. 26, and will resume next spring.
Visit the North Central Region’s
Construction Update and Travel Advisory web page.
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 and structurally 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 current proposal for a new structure includes two 12-foot lanes with 8-foot shoulders. (Currently - two 12-foot lanes with no shoulders.) The new structure will also be reconfigured to span Chiwaukum Creek with less impacts to the stream, reducing the need to clear debris (logs jams, etc.) from the bridge footings after high flow events and eliminating the undermining of the foundations due to creek scour.
Project Benefits
Provides a wider bridge with shoulders to accommodate emergency parking/recovery zone.
Oversize vehicle loads will be better accommodated with a 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 enhancements to the creek bed are also included in the design.
What is the project timeline?
Construction started August 1, 2011 and will take two construction seasons to complete in Sept. 2013.
Financial Information
Project signage will reflect the cost of construction engineering, project bid award and sales tax.
| Financial Data for PIN 200201L |
| Funding Source |
Amount ($ in thousands) |
| 2003 Gas Tax (Nickel Funding) |
$0 |
| 2005 Gas Tax (TPA) |
$454 |
| Pre-Existing Funds (PEF) |
$5,850 |
| Total |
$6,304 |
|
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.
The combined project was advertised for private contractor bids April 18, 2011. 9 qualified bids were opened on May 19. Contract #8139 was awarded to Selland Construction, Inc. of Wenatchee for $8,485,707.28 on June 24, four percent under the engineering estimate.
How can I get more information?
Contact:
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
Email: rominer@wsdot.wa.gov
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