Howdy,
The Index/Galena Rd. is the way up the N.F. Sky. (if you go to Index it's easy) Bob's right though, closed Feb 29. The N.F. Stillaguamish is always a good bet this time of year. It's open for gear until April 16th. The Hazel area offers big natives (Hazel is a good parking spot right on a big bending riprap about 5 miles east of Oso) If you hike upstream from this stretch about a half mile, there's a clay bank hole that isn't a secret, but is a long enough tromp to ease pressure. Pink/white jig might do the trick. It's C&R on wild fish, have some fun!