There was so much shit dumped in the Cuyahoga River that the river caught fire "at least 13 times" between 1868 and August 2020 when it caught fire for the last time. The river fire was referenced in The Crow, which is one of the best movies ever made.
The beautiful shores of Cleveland
The river water isn't made of water per se
The most famous fire was in 1969
The most recent fire, August 2020