When there are three important things to know:
1) Know the area you will be fishing ahead of time.
2) Start fishing dark and early in the morning; yes, dark and early.
3) Use  baits and lures that look like they belong in the river
Fish these baits in the current; letting them drift into deep pools and around and under large boulders where the fish are waiting. When using lures, try a Mepps, Super Duper, Panther Martin, Roster-tail or Kastmaster. Again, fish these in the current through calm pools behind large rocks and in deep areas in the water. Use little or no weight. Have a full spool of fresh six pound test line.
Stay low profile, fish upstream if you can, and keep your shadow out of the water after the sun appears. Do these things and you may catch a monster-set your drag! Be sure to bring a creel to keep your fish cool while you are fishing.