Woods Lake hasn’t turned over in two years to the detriment of dissolved oxygen levels at its bottom. Road salt is likely to blame.

https://www.fondriest.com/news/monitoring-key-award-winning-drinking-water-erie-colo.htm

https://www.fondriest.com/news/video-shows-lake-michigan-water-spouts.htm

Researchers gathering data on Lake Ontario are trying to understand how certain pollutants accumulate within the Great Lakes food chain.