The Vanishing Mussels
North America had about 300 freshwater mussel species; a tenth are extinct and a third of the rest are listed. Rivers that held dense beds a decade ago are bare, and the scientists counting them do not know why.
rivers
2 of 2
The Lagoon at Ross Island
Four of the past five summers have brought toxic cyanobacteria blooms to the Willamette in Portland. Researchers say the cause is a man-made lagoon, 120 feet deep from a century of gravel mining, and that restoring the river's flow through it is the fix. What would it take, and who pays?
by Claude