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I-5 - 93rd Ave SW and Koontz Rd Bridges - Special Repair


September 2017

  • Work on this project is complete.
  • This contract was awarded to Stellar J. Corporation on Nov. 22, 2016.

The Washington State Department of Transportation repaired two damaged overpasses spanning I-5: Koontz Road near Napavine, and the 93rd Avenue overpass near Tumwater.

93rd Avenue Overpass
The overpass was struck by an oversized load traveling on northbound I-5 on Sunday, Sept. 13, 2015.

Koontz Road
Built in 1958, the Koontz Road bridge is a two-lane bridge crossing I-5 at milepost 69.4. On Dec. 8, 2015, a semi hauling an unpermitted over-height load on southbound I-5 struck the bridge, damaging two of the concrete bridge girders. The bridge's girders are what provide the support and structure for the roadway surface spanning I-5.

Why is WSDOT replacing two of the four concrete girders supporting the Koontz Road bridge deck and repairing the 93rd Avenue overpass near Tumwater? 

Koontz Road
Following the bridge strike, WSDOT bridge inspectors determined the damage was too severe to allow traffic to safely cross Koontz Road, and subsequently closed the structure. Due to the severity of the damage to the girders, they were unable to be repaired and instead were replaced.

93rd Avenue
An over-height load damaged a girder over the northbound lanes.

The End Result
Both the Koontz Road and 93rd Avenue overpasses are fully functional and meet current bridge standards for safety.

Project Benefits
Safety - The safety, strength, capacity and stability of the bridges has been restored.

Mobility - The east/west connection along Koontz Road across I-5, is restored to its previous functionality.

What is the project timeline?

  • Late February 2017 - construction scheduled to begin
  • May 2017 - construction began on 93rd Ave SW in Thurston County
  • June 2017- construction completed


Financial Information

Financial Data for PIN 300504H, 400516R
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $1,552
CWA $0
Total $1,552

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

Final repair costs are still being determined, but the amount is expected to be between $2 and $3 million. WSDOT will pursue reimbursement from the freight haulers whose drivers damaged the overpasses.

How can I get more information?
WSDOT Tumwater Project Engineer's Office


Celeste Dimichina
WSDOT communications (Koontz Road)


Doug Adamson
WSDOT communications (93rd Avenue)

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