Boater favors the idea of a weir. His concept seems different than a suggestion I've made repeatedly, but it may be compatible. There already is a very good weir. It's called Bonneville Dam. Retrofit fish trapping and sorting facilities to the fish ladders, and you have a weir that is capable of live release of every single wild or unmarked fish that passes through. And hatchery fish can be sorted for any destination or disposition desired.