I5 only becomes a problem when you're going thru the passes between Cali and Oregon. If it snows there or has, then approved traction devices are required. I once got stuck for 14 hours on account the state patrol was inspecting for chains and I didn't have any. None of the stores did either... screwed up mess.

right now they have this advisory on RogueWeather.com

FREEZING RAIN IS CREATING HAZARDOUS TRAVEL CONDITIONS FROM EUGENE NORTH TO WESTERN WASHINGTON. DO NOT ATTEMPT TRAVEL!! NUMEROUS ACCIDENTS AND CLOSURES OF I 5 AND OTHER HIGHWAYS. TRAVEL IS NOT GOING TO BE RECOMMENDED UNTIL SATURDAY AFTERNOON.
Winter driving season has begun. Studded tires legal for use in both Oregon and California. Snow Zones with chain laws in effect from Redding, California to Cottage Grove, Oregon. By law, you must carry chains with you at all times, or have studded tires on.ws in effect from Redding, California to Cottage Grove, Oregon. By law, you must carry chains with you at all times, or have studded tires on.