I agree with Silver Hilton. Go where the crowds are a nd PAY ATTENTION!! Especially to the guys who are catching fish.

Also consider booking a trip with a guide who will teach you. Some will some wont. John Koenig is a good choice.

The answer to your questions is yes. Many of the tribs, such as Tokul Creek, The Tolt River, Pilchick, Sultan River, and many more hold steelhead. But the big numbers are in the big rivers they must pass through.
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No huevos no pollo.