It shouldn't - the damage dams do to our fisheries is devastating. We likely wouldn't need fish farms and genetic modified salmon if we didn't have so many dams.
I would consider them renewable as long as the river keeps flowing. The question of whether or not we should use them because of the damage to fish populations is another question entirely.
> The state applied to kill the sea lions “because their analyses showed that the high levels of predation by sea lions meant there was an almost 90% probability that one of the upper Willamette steelhead runs would go extinct,” the wildlife agency said in a statement.