Suz- I've also spoken with people with that comment about Big Joe. It's unknown what it will look like once the water comes down.
As far as my previous comment, I checked back, and couldn't pin down the exact dates of my trip, but I think the flows may have been a tad higher- 300-400 maybe? Not sure exactly.
As far as Warm Springs, we were there very shortly after the big rockfall- still had mud on the boulders on shore that was splattered across everything. It was tight, but should have been boatable. If I remember right, it was enter center, and slip right. So, a couple of goalposts in the middle, followed pretty quickly by a bfr in the middle. I think it was plenty wide enough for a raft. It was also close enough in to shore that lining would be possible. Keep in mind, this was probably 5 years ago.
Go light, mentally prepare for a little dragging, kicking and cussing, and I bet you'll have a good time. My favorite thing on that trip was how quiet it all was. We didn't see another person until Echo Park.