I'd check Idaho fish and game for price on out of state since the lake is in Idaho just saying
Makinaw trout is the most abundent.
The lake is renowned for its' lake trout, but there are so many other species. Kokane are abundant and a bit bigger than most. All of the panfish are there too. Lots of opportunities to catch fish here. The cost for an out of state license in Washington is over $80 per year. However, shorter term licenses are much more reasonable. Check with the Washington Department of Fish and Game for current prices.
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