It took until 1935 for fish wheels to be banned completely on the Columbia, but by this time the Grand Coulee Dam had been built without fish ladders, cutting off access to slews of spawning grounds. Salmon never rebounded to anywhere near historic levels.
Even though laws mandate mitigation for lost habitat, we still have overgrazed, over fished, flood prone, destroyed wetlands, because of dams. Unfortunately, not much is being done. Costs to maintain the dams are often not considered in the proposals to build dams because riparian rights are not recognized by our political system.
My rant for the week.