Cutties maybe..... and sand sharks.. so don't go there.
BGM I would think that the potholes(closure) you are thinking and the ones junior is thinking are quite a ways apart.
That said, junior, there is really very few resident trout below the falls,if any. They would probably be baby steelies (if the they were in fact rainbows and not cutties) and they are probably best left alone.
You are within the regs to fish them but just take care in doing so.