there have been some other posts on this topic so try a search. one fly that has worked very well for me the last several years is a Hobo Spey in blue and black. The Hobo spey is a style and can be tied in a variety of colors.
The General Practitioner or GP has also been successful for me. Originally tie for Atlantic Salmon it can be tricky to tie but there has been simplified versions. It supposedly imitates a prawn.
Any pattern that uses marabou will work and for years I just used a fly with marabou tied or wound on the hook. Two good patterns that use marabou are Cook's Show Girl and the Popsicle. The are very similar patterns.
How to tie a Popsicle:
https://www.youtube.com/watch?v=-f5W0kkN7x0Since you were asking about steelhead in the Stave I assume you might want patterns for there?
I'd suggest a wooly bugger in sizes 4 to 8 either black or in the egg sucking variation which just has a turn or 2 hot orange or pink chenille right at the front. These will catch cutthroat or steelhead.
The big trick is getting the fly deep enough for steelhead . You will need a fast or extra fast sinking sink tip of about 12 to 15 feet.