give this a look. some useful pics and beta for low water.
California Creeks - Selway River
i rowed it in a narrow 14ft avon ranger last year ~mid august. freakish snowpack, of course. we had to fly in to shearer due to bridge construction to paradise, as well so we did not have gauge info but guess around 1 ft+ or so. only a half ass guess though. don't sue me if i'm understating our level. the biggest trick and scout was piecing together a line through ladle and trying estimate where a 6.5 ft wide raft would fit through. i found the rest of the river was mostly read and run(super techincal R & R though) with a couple quick horizon line scouts to make sure i didn't drop into a pile of rocks.
here is a pic from the trip with the line i came up with for ladle and all i could see from about 4 vantage points. you will still get stuck on some just-below- the surface rocks and rock-n-bounce off them. the right side run was completely fucked with with picket fences of rocks and a jammed log far right by the shore.
if you suck at low water, technical then you will have a long, painful trip. if you are good then it will be a cool,fun,but challenging trip. and you will get stuck on rocks no mater how good you are on the oars. there are places with just no clean lines for a raft. be ready to leave some of your boat on the river, for sure.
good luck. leave the rod home too. no fish on the selway.....