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This would be a great location.
Tesla has been saying that a Supercharger is coming to Chelan for a couple years. I haven't heard much but last year it sounded like the City of Chelan wasn't prepared to give up any of it's limited public parking for the Supercharger. Maybe Tesla buying their own property would be the answer.
As of earlier this year, it looks like Tesla was still working on finding a supercharger host site along Hwy. 97 north of Chelan. Here's 2 documents showing they were speaking with the Okanogan County electrical utility and the town of Pateros (and maybe some other towns):