Doesn't sound like you plan to fly fish, but if you do, black zebra midges size 16-20 tend to work well.
Also, if you plan to keep any, be aware of the limits. 5 fish total.
Rainbows and brookies are protected in the 14"-20" range. Only 1 fish over 20" can be taken for each.
1 Brown can be taken but it has to be over 24".
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