I fished below the Keno dam a few times.
I'm guessing that it is staying because it has a ladder.

The water below Keno dam was a turbid, green-ish brown color probably due to the agricultural run-off upstream.
The fish were hungry resident trout and 3lbs was a very average size.

My recommendation for the New Klamath River would be to manage portions of it like the Lower Deschutes River with powerboat days on/off and no fishing from a floating device.