Is that not the polluted sewer that caught fire sometime in the not so distant past?
That would be Cleveland's Cuyahoga River. Lake Erie's pollution was pretty bad in the 60s. It does have periodic algae blooms but for the most part it's healthy now.
Lake Erie was very polluted in the 1960’s. It is now some of the best Muskie fishing in the world.
Most of Lake Erie is only about 35’ deep except in the very middle. The water volume is not nearly what the other great lakes can hold. There is only so much that can go over Niagara falls.