Ran 1.2-1.6 2 years ago. Pretty fun.
I'm used to below 2' on the MFS. I would say it was a touch tighter at the top and similar near the bottom. We Had a mix of cats and rafts, both did fine. We had a max of 1 passenger per boat. Packed fairly light, but we did take 1 cooler and real food. No beer. I rowed a 14' SB with my brother on front and swapped out on a 15' cat sometimes.
The fishing was great, the scenery was amazing and the boating was interesting but not dangerous. I think everyone but 1 boat got out in pingpong and walked it down. We picked the magic line and barely scraped at all. A 16' raft got stuck in washer woman for a bit, being slightly wider than the widest gap. The moose juice section was pretty easy IMO- compared to what I expected. Read and run technical. Although we did have a flip in wolf creek, which was funny. It is not an easy read.
I have a series of low flow selway videos on vimeo
Have fun. Bummer it is so low already.