Had to think some SG on why traps are a hard thing to do on the dams. First it would involve the Feds at several levels along with three states. Second it is impossible to sort out who is who so if you did a dam such as Bonny you would low hole Idaho and the entire inland communities of three states. Then who would get the funds for the sales as the traps would be mostly on federal property. Then the cost to build and operate the traps would be paid by who? The questions and complex nature of the with tribal and NT fisheries would be a hornets nest on fire and a lawyers dream come true.

So yup cleanest and simplest way yes as to the fish. After that it goes down hill fast.