http://69.10.163.110/billofsail/
I am planning to do this with a couple of guys who are doing their first century. Its a beautiful area. Apparently a fairly easy century, with just under 4,000 feet of climbing. Lots of nice places nearby for day trips.
Location is about 75 miles from Redding, making it about a 3-3.5 hour drive from the Bay Area. Tempurate is probably 15-20 degrees cooler than Redding, hopefully putting it in a tolerable range for mid-July.
Should be fun.