I'm surprised we could never engineer a proper salmon "elevator" to bypass the damn. Given the price of removing the damn, there seems to be a huge budget for creating some sort of high-tech Robo-elevator to scoop the fish out and drive them way upstream in a robo-vehicle.
Maybe a giant net that lies at the base of the damn, and periodically lifts out of the water to catch the fish and automate the transportation of them to ideal next step drop.
Maybe a giant net that lies at the base of the damn, and periodically lifts out of the water to catch the fish and automate the transportation of them to ideal next step drop.