Just for Information:

http://www.wildernet.com/pages/rectype.cfm?areaname=California&areaid=CA&RECTYPE=Four-Wheel+Driving&startrecord=11&CU_ID=1&nextprevious=Previous

thanks for the link that is a great site!

Be careful because some of those trail descriptions are out of date. E.g., Santiago Canyon. It has been closed for a few years now. Double check other sources before you plan a trip.

Thats a sweet web site. I've been using that for quite some time now.