That is not really far from where Kennewick Man was found. I know Indians have legends of White people amongst them. I would not be too surprised if they were here for a long time. I have read Polynesians had red and blonde hair.
I had a history teacher in high school who was absolutely convinced that all the great men in history had red hair and green eyes. She collected anecdotes that supported her theory, and discarded all factoids which did not support her theory.
If it is important to you to believe that white people with red hair and blond hair went everywhere first and did everything first, then you collect stuff like that. But the odd thing is, now that we are looking for ourselves, no traces of these legendary people can be found. Odd, no?