State Route 28 (SR 28) is a key regional highway in Central Washington that connects urban centers such as Wenatchee, Quincy, and Ephrata. This study uses three components to evaluate SR 28 improvement concepts, costs, and traffic demands. First, this study evaluates the segment of SR 28 between East Wenatchee and Rock Island, specifically from 3rd Street SE to Battermann Road. Chelan-Douglas Transportation Council and the Washington State Department of Transportation (WSDOT) anticipate significant traffic growth for this segment of SR 28 due to the planned economic expansion of Chelan, Douglas, and Grant Counties combined with local growth in the East Wenatchee and Rock Island urban growth areas (UGAs). Second, this study estimates high-level costs for a roadway expansion of SR 28 to four continuous lanes between Rock Island and Quincy and of SR 281 from Quincy to Interstate 90 (I-90). Third, this assessment includes a market analysis by Leland Consulting Group, which evaluates the development potential and associated traffic volumes for the land surrounding the study areas.