Most streams I know of on the west and eastsides of the hill have spring spawning of rainbows.

And Old Man in North Central and North Eastern Wa there is a June 1st opener for most streams. And as you said it used to be Memorial day and was always different.

I was always told it opened opened June 1st for two reasons #1 to give the bows time to spawn and also to standardize(sp?) the opener.
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Life is a beach then the sharks eat you!!!!