2024-07-22-minutes-public-works-&-cds-study-session

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2.2 Alternative 1: Widen 1-90 on the Outside Alternative 1 would widen 1-90 on the outside to add one new lane in each direction. Existing lane widths would not change, nor would the existing median and inside shoulder. The new lane would be 12 feet wide with a new outside shoulder of 10 feet (in both directions) and inside shoulders of 4 to 10 feet. The new roadway would result in three lanes in each direction. Most of the land required for expansion is located within existing WSDOT right-of-way, though some additional property will be required. Figure 2-3 presents the general alignment for Alternative 1 (as well as Alternatives 2 and 3, presented later in this chapter). Figure 2-4 shows a perspective cross-section of the proposed alternative. Considerations • Widening would occur primarily within existing WSDOT right-of-way. • Some private property impacts would occur at MP74. • Property impacts to Washington State Department of Fish and Wildlife at MP 79.1 due to realignment. CHAPTER 2: RANGE OF ALTERNATIVES • Median would stay intact, allowing for continued use for WSDOT maintenance. • Both Cie Elum River Bridges 90/134N and 90/134S would need to be replaced at MP 80.85. • Widening towards the median would still be required to locations to avoid larger impacts. • Most existing bridges spanning over the 1-90 corridor would need to be replaced. • This alternative assumes the replacement of all culverts and stream structures to the current requirements for fish or hydraulic demand. • Stormwater treatment facilities may require additional property needs due to reduction of width in the right of way. • This option provides the ability for WSDOT Maintenance and/or contractors to close a single lane on 1-90 during daytime hours and maintain two lanes of traffic. VOLUME 1: FEASIBILITY REPORT 1-90 Corridor - Easton to Cle Elum Feasibility Study 1 11