Any standard Steelhead baits or lures are going to work, roe / bags, jigs, pink worms, blades, spoons etc, small presentations can work good as the water is often gin clear. Access is difficult, you really have to look at the map, speak to takle shop guys etc and put in a lot of time up there; always take someone with you as access is often treacherous and out of cell phone range. You can shorten this process by making a friend of someone who fishes it often. The best way to do this is to go and put some time in fishing it and meet people, eventually you'll find some good spots of your own, or glean a bit of information from a regular up there, the worst way is to post about it on here where thousands of lurkers are potentially reading. People are generally not willing to give up spots face to face and about a million times less so on the internet. Not trying to the "that guy" just speaking from personal experience.
Cheers,
Nick