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Project Title & Location
I-5/SR 161 I/C & SR 18 I/C (Triangle)
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Project Description
The I-5/SR 161/SR 18 Interchange Improvement project (Triangle Project Phase 1) includes replacing a cloverleaf loop ramp with a flyover ramp for WB SR 18 to SB I-5 traffic and provide a new WB SR 18 connection to SR 161. The I-5/SR 18 cloverleaf interchange is defined as a High Accident Location. Eliminating one of the loop ramps will eliminate the weave on WB SR 18 and SB I-5. These improvements will improve traffic flow and safety.
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Contractor/Consultant
Consultant Berger/ABAM
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Recent Progress
Completed geotechnical borings for walls and bridges.
Continued coordination with utility companies to discuss areas of potential conflict and develop plans for verifying utility locations near conflict areas.
The Channelization Plans have been revised and are awaiting final approval.
Plans, Specifications and Estimate phase and preliminary bridge plan design ongoing.
Phase 1 Right of Way plans approved by HQ.
Acquired wetland and stream mitigation property.
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Design Construction Impacts
There is not enough funding for full build out, so the project will be constructed in phases.
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Environmental Impacts / Compliance
Developing plans for wetland/stream mitigation site. Working with Puyallup tribe to develop compensatory mitigation plan in leiu of replacing fish blockage culvert.
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Impacts to Traffic
A staging plan will be developed to minimize traffic impacts during construction. There will be impacts to I-5 to set the steel girders for the flyover structure.
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