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• 2004 Project Highlights
• Evaluation Standards
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I-90, Tibbetts Creek Vic. Culvert Replacement
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King County
Crews replaced four culverts that carry Tibbetts Creek under I-90 in Issaquah with two new bridges. Tibbetts Creek overflowed during heavy rainfall because the culverts were too small and sometimes clogged with debris.
The new bridges will reduce flooding and improve fish passage and habitat. Chinook, Coho and Sockeye salmon call Tibbetts Creek home. The project will also save money by reducing our need to send maintenance crews to monitor and clear the culverts. This project is the last piece of a decade long, extensive stream restoration project known as the Tibbetts Creek Greenway Restoration.
Construction Summary
This project is nearly complete. Only landscaping work remains. WSDOT and our contractor, Pacific Road & Bridge, worked together effectively and delivered this project ahead of schedule. This project came in slightly over budget due to a design oversight.
We made a few changes to the project to save money, enhance safety and help keep traffic moving. We eliminated a proposed construction island in the westbound freeway lanes. To eliminate this island we temporarily shifted traffic around the work area using the center of the freeway. We also coordinated traffic control and work schedules with three adjacent WSDOT construction projects. This reduced driver confusion and minimized lane closures. We had to change the bridge design to use permanent sheet pile walls instead of pre-cast walls. The sheet pile walls were easier to install and allowed us to complete the work faster.
Contractor:
Pacific Road & Bridge, Arlington, WA
WSDOT Contact:
Brian Dobbins, Project Engineer
Phone 425-956-2114
E-mail: dobbinb@wsdot.wa.gov
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