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Is there a law on how many crawdads/crayfish I can catch in Cascade lake?

Answer

 Crayfish do not have a specific possession limit, however you can only have up to 5 traps at one time without obtaining a commercial fishing license and trap tags.

This is from the 2012 fishing regulations:

Trapping or Seining Minnows and Crayfish:

Nongame fish (minnows), yellow perch, and crayfish may be taken only

in waters open to fishing; provided the seine or net does not

exceed ten (10) feet in length or width, and nets and seines

must have three-eighths (3/8) inch square or smaller mesh;

and the minnow or crayfish trap does not exceed two (2) feet

in length, width or height. If the trap is of irregular dimension,

but its volume does not exceed the volume of an eight (8) cubic

foot trap, it is also legal to use. Nets and seines may not be

left unattended. Traps must be checked at least every forty eight

(48) hours. All traps must have a tag attached bearing the

owner’s name and address.

All game fish (except yellow perch) and protected nongame

fish incidentally taken while trapping or seining must be

immediately released alive. All fish so taken must immediately

be killed except where stated otherwise. Crayfish may be kept

alive to be used as bait only on the water where captured.

Nongame fish and crayfish may only be taken during the season

set for the taking of game fish in those waters.

Only five (5) crayfish traps can be fished with a valid fishing

license. If more than five traps are used at one time, you must

obtain a Commercial Fishing License and trap tags.

It is illegal to destroy, disturb, or remove any traps belonging to

others.