November 2009
Crews expect to finish the entire project in February 2010.
Get lane closure information (search for #7622)
Seismic retrofit work continues on the following bridges and overpasses this month:
- West Lake Sammamish Parkway/I-90.
- I-90 overpass at 150th Ave. SE.
- I-90 overpass at the Eastgate Park and Ride. Lane closures are expected to start in early December. In addition to lane closures, crews also will use spaces in the Park and Ride lot to store construction equipment.
- See Flickr photos of work in progress.
- We have suspended work on I-90/Richards Road. The work will be completed at a later date.
WSDOT will bring 13 bridges up to current earthquake standards on Interstate 90 between the Eastgate Park and Ride and Front Street.
We had intended to retrofit overpasses at Richards Road and Winery Road in this project, however both of these overpasses have been removed from the scope of the project.
The I-90 overpass at Richards Road will be seismically retrofitted at a later date. The I-90 overpass at Winery Road will be added to a future seismic retrofit project as funding becomes available.
Why is WSDOT
improving overpasses and bridges on I-90?
WSDOT is seismically retrofitting the columns that support several I-90 overpasses and pedestrian bridges. In plain English, seismic retrofitting means improving an overpass or bridge to protect it against future earthquakes. Although all of our overpasses and bridges are all structurally safe for everyday traffic, simple upgrades can go a long way towards keeping them intact and motorists safe in the event of a large earthquake.
The End Result
Crews will retrofit the overpasses and bridges by strengthening columns to prevent girders from falling off the bridge piers during an earthquake. Once retrofitted, the bridges will be able to withstand greater seismic stress caused by earthquakes.
Some of the bridges spanning I-90 include:
- Front Street overpass
- 142nd Place SE overpass
- 150th Avenue SE overpass
- West Lake Sammamish Parkway overpass
- Pedestrian bridge near the Lake Sammamish Parkway and I-90. this bridge spans the Lake Sammamish Trail.
Project Benefits
- Safety: Improving the overpasses and bridges will reduce the risk of catastrophic failure during an earthquake.
- Environment: Crews will filter storm water runnoff during construction.
What is the project timeline?
- October 2008: We publicly advertised this project to contractors
- November 2008: We selected IMCO General Construction
- March 2009: Construction begins
- February 2010: Estimated completion
Financial Information
This project is funded through the following sources:
- 2005 Gas Tax (Partnership Funding) - $8.2 million
- Existing Funds - $2.0 million
- Total Funding Available From All Sources - $10.2 million
How can I get more information?
Contact:
Paul E. Johnson
WSDOT Project Engineer
6431 Corson Avenue S.
Seattle, WA 98108
Phone: 206-768-5680, or
E-mail: JOHNSPA@wsdot.wa.gov
or
Broch Bender
WSDOT Communications
15700 Dayton Avenue North
PO Box 330310
Seattle, WA 98133
Phone: 206-440-4702, or
E-mail: BenderB@wsdot.wa.gov
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