SiskiyouCounty Road Conditions
http://www.dot.ca.gov/cgi-bin/roads.cgi (type in I-5)
Highway Patrol Incident Report (type in Yreka)
R-1 modified: Chains required on all single axle drive trucks and vehicles towing trailers.
R-1: All vehicles except autos and pickup trucks with 4 snow tires.
R-2: All vehicles except 4WDs with snow tires.
R-3: All vehicles.