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Project Title & Location
I-5 - Mellen Street to Grand Mound
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Project Description
This project will widen seven miles of I-5 between Mellen Street in Lewis County and the Grand Mound interchange in Thurston County to increase traffic flow and safety. The project will be constructed in three stages- Stage 1: Blakeslee Junction to Grand Mound, Stage 2: Mellen Street to Blakeslee Junction, and Stage 3: Mellen Street Improvements.
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Contractor/Consultant
David Evans and Associates, Inc. is performing the design for Stage 1 and the environmental reports for Stage 2.
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Recent Progress
Stage 1: The Environmental Discipline Reports for DCE are complete. Consultant finalizing stormwater treatment designs, working toward 60% constructibility review and finishing right-of-way plans.
Stage 2: WSDOT working on design of the new interchange ramp terminals. A consultant is developing plans to demolish a portion of the the old city of Centralia wastewater treatment plant to provide space for the interchange ramp improvements. A consultant is working on the environmental documentation.
Stage 3: Design and environmental work is under way. The project team is gathering data for environmental reports, and setting up the communication plan for the project.
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Design Construction Impacts
Stage 1: Construction is currently scheduled for 2009. Anticipated construction impacts will be assessed as the design phase is advanced. Close coordination of construction staging is on going with the Grand Mound to Maytown project.
Stage 2: Construction is currently scheduled for 2010. Anticipated construction impacts will be assessed as the design phase is advanced.
Stage 3: Construction is currently scheduled for 2011. Anticipated construction impacts will be assessed as the design phase is advanced. Constructability is a major element in the design of this complex portion of I-5.
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Environmental Impacts / Compliance
Stage 1: Stormwater treatment for flow control will require off-site mitigation and right-of-way acquisition.
Stage 2: Design working on defining the project impacts for environmental mitigation.
Stage 3: Currently working on applicable environmental documentation.
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Impacts to Traffic
Stage 1, 2, & 3: The design team will generate effective staging plans to minimize construction impacts to the traveling public.
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