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


May 2017

  • During repairs, westbound access across the 93rd Avenue bridge will detour via I-5, and Tumwater Boulevard. The bridge is expected to fully reopen in June after the girder is replaced.
  • Advance information concerning 93rd Avenue overpass work is available at the Thurston County travel advisory web page.
  • Get the latest Koontz Road travel information by visiting our travel advisory webpage.
  • We awarded this contract to Stellar J. Corporation on Nov. 22, 2016.

In this project, the Washington State Department of Transportation is repairing damage to two overpasses spanning I-5: Koontz Road near Napavine, and the 93rd Avenue overpass near Tumwater.

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

Drivers can expect the westbound lane across 93rd Avenue over I-5 to close around the clock through June.

During the closure, westbound 93rd Avenue drivers east of I-5 will have no access to southbound I-5, and northbound I-5 drivers will have no access to westbound 93rd Avenue over I-5. Drivers will detour via Tumwater Boulevard.

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.

Additionally, due to the severity of the damage to the girders, they were unable to be repaired and instead were replaced.

This closure remains in effect until repairs are completed in late spring 2017.

93rd Avenue
While the overpass remained open to traffic, the oversized load did damage a girder over the northbound lanes.

The End Result
Once construction is complete, both the Koontz Road and 93rd Avenue overpasses will be fully functional and will meet current bridge standards for safety.

Project Benefits
Safety - When construction work is complete, the safety, strength, capacity and stability of the bridges will be restored to their previous safety levels. 

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

What is the project timeline?

  • Late February 2017 - construction scheduled to begin
  • Mid-spring 2017 - construction scheduled for completion  
  • Week of April, 24 2017 - construction scheduled to begin on 93rd Ave SW in Thurston County


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) $2,921
CWA $0
Total $2,921

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?
J. Dewayne Matlock
WSDOT Project Engineer


Celeste Dimichina
WSDOT communications (Koontz Road)


Doug Adamson
WSDOT communications (93rd Avenue)

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