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•Y: -�yr, �y_ •55 rt`"i - p PROJECT BACKGROUND In response to citizen-led task forces such as the Upper Kittitas County Traffic Committee, working groups, and public comment, Kittitas County Public Works initiated the 1-90 Corridor—Easton to Cie Elum Feasibility Study in partnership with corridor stakeholders including the Washington State Department of Transportation (WSDOT) and the Safety, Transportation, Environment, Equity, and Resiliency on 1-90 (STEER I-90) Coalition. Study Area West Easton interchange at milepost(MP)70.3 Interstate 90(1-90)spans 300 miles in and ending at the 1-90/State Route 970/903 Washington State from the Port of Seattle to the interchange at MP 85 within WSDOT s South Idaho state line, continuing east across the United Central Region, and the Upper Kittitas County States. 1-90 is the major east-west transportation surrounding communities. Upper Kittitas corridor in Washington State and is vital to County generally includes the Town of South commerce, economy, and recreation statewide. Cie Elum, City of Cie Elum, City of Roslyn, and Passing through Kittitas County it is a scenic the areas of Ronald and Easton. highway identified as the Mountain to Sound Study Objectives Greenway(National Heritage Area). Residents, tourists, and businesses have long commented on The feasibility study aims to investigate concerns from stakeholders by engaging transportation inefficiencies between Easton and agencies and the public to identify and describe Cie Elum impacting safety,freight, and mobility. issues related to transportation demand, The area of study is located along the 1-90 safety,freight mobility,the environment, corridor from Easton to Cie Elum, a 15-mile resiliency, and equity/inclusion issues within portion in Upper Kittitas County beginning at the the study area to identify possible solutions. VOLUME 1: FEASIBILITY REPORT 1-90 Corridor-Easton to Cle Elunn Feasibility Study I xiv