https://phys.org/news/2018-06-oregon-algae-blooms.html

In both reservoirs and lakes used for recreation in communities around the country have been experiencing similar events with growing frequency; a trend that researchers say represents another impact of global warming and raises looming questions about their effects on human health.

"When water bodies warm up earlier and stay warmer longer... you increase the number of incidents," said Wayne Carmichael, a retired Wright State University professor specializing in the organisms. "That's just logical, and it's being borne out."