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Project Title & Location
I-405/West Valley Highway to Maple Valley Highway in Renton
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Project Description
Project includes Nickel and TPA projects components to construct additional northbound and southbound lanes from I-5 to SR 169 and a separate southbound SR 167 lane between I-405 to SE 180th St.
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Contractor/Consultant
HNTB Corporation is the lead consultant of the General Engineering Consultant Team.
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Recent Progress
Environmental process is on schedule despite design modifications required to overcome soils issues at the bridges. Initiated CEVP adjustment to evaluate project budget and account for the modifications addressing poor soils and condition of bridge foundations. Approximately ninety-nine utility crossings were identified as being affected by the proposed widening. Most crossings may require protection, but at least two will require relocation. Development of the contract drawings continued for the Springbrook Early Environmental Investment (EEI) for wetland impact mitigation. Existing right of way plans and 30% PS&E documents for proposed Springbrook EEI Project were completed.
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Design Construction Impacts
The West Valley Highway to Maple Valley Highway (Nickel) project is essentially a widening project for northbound and southbound I-405 legs approaching the SR 167 Interchange. Retaining walls will be utilized wherever necessary to minimize impacts to adjacent properties, wetlands and drainage facilities. The Benson Structure Overcrossing, including the center pier located in the I-405 median, will be replaced to accommodate the proposed widening of I-405 and the final alignment of I-405 anticipated for the Master Plan. The project also extends the southbound SR 167 HOV lane north to begin under the I-405 Structure. Widening and restriping of southbound SR 167 will also be required.
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Environmental Impacts / Compliance
A corridor wide Record of Decision for the programmatic FEIS was received in October 2002. Project environmental documentation began in January 2005. Detailed design work is continuing for an "Early Environmental Investiment" site near Springbrook Creek in Renton.
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Impacts to Traffic
It is expected that impacts to the traveling public can be minimized during construction.
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Milestones |
Scheduled |
Attained |
Milestone Outlook |
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Preliminary Engineering Start (Nickel funding)
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July 2003
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July 2003
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Nickel funded engineering work began on schedule.
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Finding of No Significant Impact
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Jan. 2007
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On schedule, no issues at this time.
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Right of Way Certification
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Oct. 2007
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On schedule, no issues at this time.
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Request For Proposal
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April 2007
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On schedule, no issues at this time.
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Open to Traffic
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Dec. 2010
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On schedule, no issues at this time.
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