I live in Arizona and have been to Fossil Creek quite a few times. The flow there is usually about 43 CFS- it is barely runnable. You pretty much scrape your way down and there areonly 2 waterfalls. You also have to hike your boat 45 minutes to the put-in at the 20 foot waterfall. I live 2 hours away and the only time I have driven out there is in the middle of winter when there is nothing else to run. I don't think it would be worth a trip to AZ by itself. The Salt river usually starts running in March if we get enough snow on the White Mountains, which we don't have much of yet. But if your going to AZ, wait till March so you could run the Salt and Fossil Creek before stuff starts running in CO.