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Project Title & Location
SR18 - Issaquah/Hobart Rd to I-90 - EA - 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
Completed alternative screening process and finalized the preferred alternative recommendation. Began environmental analysis and design of the preferred alternative. Plans are under way for the second public open house to be held in November to present the selected design.
Completed the scope of work for the supplemental consultant agreement and concluded the negotatiations. The new agreement will complete the SR 18 corridor analysis and detailed environmental evaluation of the I90 / SR 18 interchange. It will also complete the I90 / SR 18 interchange design documentation and will further other related design elements to the extent possible.
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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 in early stages of the environmental documentation process. During this process, the design team will identify project impacts and address compliance issues.
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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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