I-5, Ramps at Michigan-Corson, Albro, Swift

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King County
WSDOT and our contractor repaired and paved I-5 ramps at Corson, Michigan and Swift-Albro, between Spokane Street and Boeing Access Road in Seattle.  We fixed rutted and cracked shoulders, lanes and bridge decks; replaced damaged concrete panels on southbound I-5; replaced traffic signals; and improved guardrail.

Paving the ramps and replacing the concrete panels gives drivers a smoother ride with improved traction.  We improved safety by removing gutters and curbs in the shoulders and upgrading guardrail.   Work also extended the life of the aging freeway.

Design:  Construction:   Schedule:  Cost:  Engineers estimate: $2,103,356 Contractor's bid amount: $1,995,984 Anticipated final payment to contractor:  $2,200,000

Construction Summary
For the most part, construction followed the original design except for the electrical work, which presented a challenge.  Some of these changes were due to unforeseeable underground conditions such as solid rock encountered during excavation.  Other changes were a result of existing above ground features, which a field review could have caught.  Both types of changes added cost to this job. At least one issue regarding the source of power for the signal systems extended the work within this construction season.

WSDOT and Mowat Construction have a good working relationship despite this project's challenges and some resulting frustrations on both sides.  These include problems coordinating and scheduling work given various locations and types of work, and changes required due to conditions encountered in the field. 

We originally planned to complete the project in the 2004 construction season, but we had to extend the project into the 2005 construction season.  We extended the project because the amount of deck repair was greater than we anticipated and because we could not complete striping before the temperature and weather deteriorated in the fall.  We could not determine the deck repair amount in advance because of an existing overlay that was removed as part of this contract.  The need to complete the deck repair will add days to this contract.  In addition, the electrical issues extended work in  the present construction season.  We expect the electrical work to be completed by the end of 2004. 

The contractor’s original bid amount was approximately $2 million.  We estimate the  final payment to the contractor  to be $2.2 million.

Contractor:
Mowat Construction Co., Woodinville, WA

WSDOT Contact:
Julia Mizuhata, WSDOT Project Engineer
Phone 206-764-4105
E-mail: mizuhaj@wsdot.wa.gov

More information on the I-5, Ramps at Michigan, Corson and Swift-Albro project.

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