Toxic blue-green algae can sicken people and animals. Few states have routine testing programs to check for algae, so some local and volunteer groups are stepping in to fill that gap.
Daphnia, tiny crustaceans in Lake Mendota that graze on algae, and their good works are in danger. Each year their population is now crashing in the late summer as they are decimated by a voracious new predator called the spiny waterflea.
How to spot them, what to do if you do, and signs of illness.
The Yahara watershed is crawling with scientists who keep trying new ways to clean up the lakes.
The Yahara lakes — Mendota, Monona, Wingra, Waubesa and Kegonsa — are no clearer than they were 30 years ago, despite intensive efforts to improve them.