I fish the river pretty regularly and the chinook during the month of May was terrible. the water was dirty and honestly i have found no one that has caught a fish this year. Also unless something has changed make sure to check the emergency regulations because the river closed on May 31st. You would likely be better served to head out to one of the lakes in your area.
The Skagit River is open from the Hwy 530 bridge at Rockport, upstream to the mouth of the Cascade River from June 1st until July 15th. Limit is 4 hatchery Chinook, with only 2 being adults.