With regards to the San Rafael, it's been running a few times already this year. Mostly from rain during the past couple storms. Essentially, the run is the upper and lower black boxes. Unless you want an epic hike out of the river, it's easiest to go to the dirt roads that come in from 70 east of the swell. It's agreat run, and I'd love to paddle it again. The rapids in there are generally formed from boulder falls and a pretty sievey. I remeber one in the upper that freaked the hell out of me becuase you basically had to get ot of you boat onto a slick boulder with all the water going under it... Anyway, keep an eye on the rain.
Also in Utah and worth checking outis ferron creek and the fremont above Capital reef. I'll put the info on the Aw site this week. Ferron has a class V section (according to guidebook -- I haven't seen it with water) and the fremont has is a fun class IV run with lots of blindness and brush. Of course, it doens't really compair to OBJ, Vallecito or and of the Colorado classics. There are a few other creeks rolling off the wasatch plateau like the left hand fork huntington Seeley, and Cottonwood. (The later is below a reservoir which is pretty empty.)
Now for the bad news. They're all snow melt driven runs, and the snow is up around 11,000 feet. With the exception of the Fremont and Boulder Creek (trib of the escalante). They don;t really get going until later in the Spring. (Like May or June whenever the pack goes isothermal and moves off.) You can check the status of the melt at http://www.cbrfc.noaa.gov/snow/snow.cgi
Finally, the San Rafael isn't a guranteed thing either since Joes Valley reservoir, Huntongton North, and Mill all sit upstream and are pretty dam empty. Last time the San Rafel went was after a couple of years of decent precip so they let a lot of water go by. It's not totally hopeless, but it's also not a gurantee. Send me a message if you want.
Ohh, and it looks like Southern eastern Arizona's gonna get another shot of moisture this weekend.