ahh fishing for rainbows in salmon ifested water, I usually use 9ft leader, 2-3x tipit with egg patterns or flesh patterns dead drifted.
If the salmon are in their thick you will not be able to get a good drift so go home, or put up with the fact you are going to snag a couple acidently.
but if they are thining out and the salmon are spawning you will have a great time.

oh and these things work great for egg imitations

http://troutbeads.com/