Brian, FYI, unless something has changed recently, the entire Snohomish system is closed for coho this year, at least until further notice. Rumor has it that the Skagit might open this week though. Coho in rivers are frustrating. First I'd try the second to the smallest **** nite, 50/50, on as long a leader as you can cast with, fish it just like drift gear. Next I'd go in the other direction and cast wiggle warts or magnum wiggle warts if your on shore or troll/back troll them from a boat in traditional coho holding areas.

Good luck!
Beezer