- This project is functionally complete but there are a few punch-list items to complete such as landscaping, etc.
- WSDOT awarded the contract to Tri-State Construction. Construction began January 2011.
- Traffic over I-5 from US 12 or Old Highway 99 is on the new bridge across I-5.
- Three lanes of I-5 are open to traffic in each direction at 70 MPH.
- Six new cameras came online in December 2012 between Grand Mound and Maytown.
Why is WSDOT
replacing this interchange?
Rebuilding the I-5/US 12 interchange at Grand Mound improves mobility and safety.
The End Result
The project modifies the interchange configuration. Both loop ramps are eliminated. Traffic signals are installed at both ramp intersections resulting in a typical "diamond" interchange configuration. On the east side of the interchange, the two existing exits from northbound I-5 are consolidated to one exit point.
The alignment of the US 12 roadway across the interchange is shifted to the north. This allows both bridges (over I-5 and the railroad) to be replaced with minimal impact to traffic.
- Safety. The project realigns and lengthens on- and and off-ramps at the interchange to provide the more room for vehicles to safely enter and exit the highway, adds signals and improves driver sight distance.
What is the project timeline?
The project is currently under construction and scheduled for completion October 2012.
Project signage will reflect the cost of construction engineering, project bid award and sales tax.
This project is funded from the following sources:
- 2003 Gas Tax (Nickel Funding) - $26,564,669
- Total Funding Available From All Sources - $26,564,669
How can I get more information?
Dennis Engel, Project Engineer
WSDOT Tumwater Project Office
821 Airport Court SE
Tumwater, WA 98501-6805
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