- Construction began in June.
- Lane reductions started July 7.
- Tuesday, July 22 to the morning of Wednesday, July 23 - Southbound I-5 will be reduced to one lane from 236th Street Northeast to the Stillaguamish River Bridge from 10 p.m. to 5 a.m. During that time, the southbound lanes will be shifted to share the northbound bridge. Also, the ramp from 236th Street to southbound I-5 and the southbound I-5 ramp to SR 530 will be closed from 10 p.m. to 5 a.m. for lane striping and road work. Signed detours will be in place.
- The speed limit will be reduced to 55 mph throughout the project.
- The lane shift will remain in place into November.
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Why is WSDOT
replacing the deck on this bridge?
Two bridges cross the Stillaguamish River on I-5 just north of SR 530 and just south of Stanwood (SR 532). The southbound bridge is older, built in 1933.
At 81 years old, the bridge deck has pot holes and and cracks, and there are also portions of supporting steel framework underneath the deck in need of replacement. This summer, contractor crews will remove and replace the entire bridge deck and the portions of supporting framework that need replacement.
This bridge was last inspected in 2012 and is safe for drivers. However, this bridge is on WSDOT’s Structurally Deficient bridge list due to the needed deck and framework repairs. Once the bridge deck is replaced, the bridge will be taken off the Structurally Deficient bridge list.
To replace the southbound I-5 bridge deck, the bridge will be closed for the summer. To keep traffic moving, contractor crews will build a temporary roadway across the I-5 median and reconfigure the northbound bridge to accommodate traffic in both directions. As traffic approaches the bridge, both directions of I-5 will be reduced from three to two lanes, with a reduced speed limit of 55 mph.
On average, roughly 80,000 vehicles drive this section of I-5 daily. These numbers increase during the peak summer travel period.
The End Result
This project will replace the bridge deck on the southbound I-5 bridge, preserving this vital link for years to come.
- Preservation: This project improves and preserves a vital bridge in the state's bridge inventory.
- Economic: This bridge is an important part of the I-5 corridor. Maintained properly, it will continue keeping up with the demand of commuter and freight traffic for years to come.
What is the project timeline?
- February 2014 - Project goes to advertisement so contractors can bid on it.
- March 2014 - Award project to contractor.
- May 20, 2014 -Mowat Construction Co. is awarded contract.
- June 2014 - Begin construction of crossover and prepare northbound bridge to carry two-way traffic.
- July 2014 - Close and begin repairs on southbound bridge. I-5 reduced to two lanes in each direction. Speed limit lowered to 55 mph.
- November 2014 - Reopen southbound bridge.
- Fall 2014 - Remove median crossover and complete project.
|Financial Data for PIN 100553V
||Amount ($ in thousands)
|2003 Gas Tax (Nickel Funding)
|2005 Gas Tax (TPA)
|Pre-Existing Funds (PEF)
Project signage will reflect the cost of construction engineering, project bid award and sales tax.
Total project cost: $8,687,999
How can I get more information?
WSDOT Project Engineer
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