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Do you require a permit to trap crayfish in Lewiston, ID even if you place less than 5 cages/traps?

If you have 5 or fewer traps you don't need any special permit but you must have a fishing license.  (More than 5 requires a Commercial Fishing License, available from a Fish and Game office).

Answer

If you place 5 or fewer traps, you do not need a special permit.  You are, however, required to have a fishing license.