A 400km route concept is shown below. The route takes advantage of familiar (to local riders) routes, adventure-potential with the Naches-Ellensburg-Selah leg, has good services and a better than even chance of a tailwind for the last 50-100km. Details pending.
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Another concept follows:
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Each of these has the benefit of finishing with very accessible food/drink access, and very nice scenery. Opinions are solicited.