actually, I am sorry to say that San Juan passed away this past winter in the high water floods we had out here. The Juan use to be good from 1400-2200, now it is apparently worthless at all flows. I only know first hand at 1900 and 1800, but have friends who have been there at a large range of flows this fall and all accounts agree, the Juan is dead.
You can do half a flat spin on it now....but then you wash off. It isnt much good for anything else. Supposedly there is a flow which is still good, but it was supposed to be 2000 which wasnt... so i dont know what it is, heard maybe 2200. If you still want directions check out: http://www.awetstate.com/AmericanSJ.html