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Project Title & Location
I-90 - Snoqualmie Pass East - Hyak to Keechelus Dam
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Project Description
This project will improve I-90 to provide a safer, more efficient six-lane freeway from Hyak to Keechelus Dam. This project is the first of several projects that will address concerns along I-90 from Hyak to Easton. Tunnels and/or mitigation measures will minimize avalanche closures and hazards due to rockfall. Aging pavement will be replaced to provide a smoother ride. Expanded bridges and culverts will minimize wildlife collisions by providing safer crossings.
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Contractor/Consultant
General Engineering Consultant:URS Corportation - Headquartered in San Francisco, CA
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Recent Progress
WSDOT has received the draft conceptual geotechnical recommendations package from URS. Based on these recommendations, refinements to the final alignment are proceeding, preliminary wall design studies have begun, as well as evaluation of bridge design. Stormwater analysis work has also begun.
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Design Construction Impacts
Due to the onset of winter, no field work is planned. The rockfall protection fence constructed this summer (MP 58.8) for the exploratory work, will remain in place until the project goes to construction.
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Environmental Impacts / Compliance
Wetland Impact assessments are expected to be completed by the end of December 2006, with wetland designs following. The I-90 Inter Disciplinary Team (IDT) has been reassembled, including some different members. The purpose of the IDT is for evaluation and management of risks associated with mitigation and permitting. This new IDT met for the first time, last month.
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Impacts to Traffic
Due to the onset of winter, no project-related impacts to traffic are planned.
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