I am pretty sure ACH is closed above La Canada Flintridge. Most likely to open at end of 2010 is what I last read. You have to go Big Tujunga Canyon Rd. to get into the Angeles National Forest.

http://www.bikeforums.net/showthread...-Crest-Highway
http://dpw.lacounty.gov/CARE/files/caltrans051310.pdf