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Project Title & Location
US 12 – Phase 4, Walla Walla to Wallula Planning Study, Walla Walla County
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Project Description
This planning study will prepare initial environmental documentation to determine the preferred corridor alignment for US 12 from the Wallula junction to Walla Walla, addressing congestion and safety needs for the highway.
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Contractor/Consultant
David Evans and Associates has been retained to prepare the Environmental Resource Reports.
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Recent Progress
WSDOT continues to refine the alignment, profile, intersection, and interchange designs. An alignment change was developed and implemented to minimize our impacts on the Gary and Gene Banks Farm.
WSDOT and David Evans and Associates (DEA) have finished most of the field studies and have sent draft Resource Reports to WSDOT for review.
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Design Construction Impacts
Changes to the seismic codes have created an increase in cost for the bridges from $300/sq ft to $600/sq ft. A VE/CRA study is proposed to review the bridges over the four canyons and the design of Phase 7 to improve the concepts for design and/or reduce the dollar amounts in the estimates.
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Environmental Impacts / Compliance
An Habitat Connectivity Team was formed to investigate possible impacts to wildlife along the Phase 8 corridor. The Team consists of biological experts from County, State, and Federal agencies.
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Impacts to Traffic
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