My UNM Water Resources Program colleague Becky Bixby, on New Mexico public telly explaining our spate of rare (for us in northern NM) algal blooms:
jfleck at inkstain
A few thoughts from John Fleck, a writer of journalism and other things, living in New Mexico
California has been a summer of warnings/closure of lakes due to algae blooms. Can’t remember this occurring in earlier years.
For the lakes that I know, I suspect that there may be an interaction with water quality of inflows.