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Project Title & Location
SR18 - Issaquah/Hobart Rd to I-90 - Maple Valley to Snoqualmie
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Project Description
This project will complete the environmental work for widening
SR 18 to 2 lanes each direction with truck climbing lanes between
Issaquah/Hobart Road and I-90, constructing a new interchange at Tigergate
summit and making improvements to the I-90/SR 18 interchange.
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Contractor/Consultant
Consultant - HDR Engineering
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Recent Progress
Project moving forward with Value Engineering (VE) Study recommended revised ramp alignments that offer reduction in wetland impacts, improved project quality, and construction cost savings. Continuing work on project technical analysis and SR 18 / I-90 Interchange Justification Report for Federal Highway Administration (FHWA) approval.
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Design Construction Impacts
Construction phase not yet funded. Please see the project page for more information.
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Environmental Impacts / Compliance
The project is continuing efforts to identify sensitive areas along the revised ramp realignments in order to minimize environmental impacts.
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Impacts to Traffic
The completed SR 18 project will improve traffic flow and safety on the highway.
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