lower should be OK
we ran lower CC from elbow to the park last year around 250. it was ok, bony in spots but still enough water. we ran it again when it was higher, at about 500, and SQM was much faster and more challenging at higher flows. still need to portage the diversion structure above tunnel 1 at all levels IMO.
don't know about the upper reaches. ran from dumont to kermit's last year around 600, and that was a blast. not sure if there is enough water now to get over the fish ladders, and outer limits might be bony too.