The trout water ends where Condor Creek comes in. From that junction down to the wall of Cotter Dam, including the reservoir, the Cotter is Prohibited Water under the territory's rules, and fishing is not allowed at any time.
Anglers working down the trout water need to know where to stop, and anyone arriving at the Cotter Reservoir needs to know the fishing is not there. The river below the dam has its own page.