Can you use treble barbless hooks on steelhead?

Answer:

Only barbless hooks with a maximum 5/8 inch gap between shank and point may be used when fishing for steelhead in the Salmon and main Cleawater river, and the Snake River below Hells Canyon Dam.  Bending the barb(s) down to the shank of a single, double, or treble hook will meet this requirement.

Only single-pointed barbless hooks are allowed when fishing for steelhead in the South Fork Clearwater River.