Either kings or bull trout.
We used to fish Cushman a lot in the 60’s and 70’s for Kokanee.
Had good success. If I recall correctly it was a 16 fish limit back then on kokes. Our go to was lead core line, long mono leader and a silver with red head triple teaser. Caught some nice big cutts as well.
Never caught any bull trout but a buddy got one that was about 12 lbs or so trolling a spoon.
Would have loved to have seen the NF Skok and the gorge and lake up there before it was inundated.
Visiting the old Marcus Nalley cabin on the other side of the lake was always a fun experience as a kid.
SF