Well lets see. Close down a river to protect the spawning fish Salmon and Steelhead. Well the did that to a river System in Eastern Washington. They closed the Wenatchee river system down to protect the spawning wild fish and then in the few years they planted 750,000 hatchery fish. I don't think that is the way to protect the fish and still they don't open it to harvest the hatchery fish. No closing down a system won't work as long as people keep snagging fish and disreguard all fishing rules. Just my opinion.