That's not Tacoma's decision to make. It's the utilities responsibility to provide upstream and downstream passage for all fish arriving at their dams. Period. It's the law. That said, there are practical considerations. Like, why would a fish manager send his 2 million hatchery smolts through a predator-filled reservoir and through a 95% effeiciency fishway, when they could be loaded into a truck and hauled downstream of the dam?