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Project Title & Location
I-5, Grand Mound to Maytown Widening - Thurston County
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Project Description
This project widens I-5 from Grand Mound (US 12 West I/C) to Maytown by adding one lane in each direction. The work includes flattening an existing freeway curve, improving the Grand Mound and Maytown interchange ramps, and improving Rest Area ramps. There are currently four lanes. There will be six lanes when this project is completed.
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Recent Progress
Progress has been made toward developing the project design to help determine what additional right of way is needed for the project. This has included finalizing the ramp alignments at the Grand Mound Interchange along with retaining wall locations and a strong emphasis on the storm water treatment design as well as pond locations. Right of way plan development should begin this spring.
The Design Office is beginning a Cost Risk Assessment. The modeling work should be completed in April. This will provide a good picture of how the budget for the project is standing up, as well as provide a tool to manage the various risks in the project.
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Environmental Impacts / Compliance
This project will have minor wetland impacts. The Wetland Biology report is currently being updated with new wetland classifications in order to identify mitigation for the project.
One existing culvert on this project has been identified a fish passage barrier. The design team is developing plans to replace this culvert with one that will allow fish passage to upstream habitat.
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Impacts to Traffic
During construction, nightly lane closures and daytime width reductions will be necessary.
You may see equipment along the highway shoulders this fall doing exploratory soils investigations or project surveying.
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