The algae bloom forming around Ross Island Lagoon in the Willamette River on Monday morning. (Photo courtesy of Eagle Eye Droneography) The thick, green layer of toxin-producing algae currently ...

Update August 19, 2025: The Oregon Health Authority lifted its advisory warning of a harmful algal bloom on the Willamette River, stating "water monitoring has confirmed that the level of cyanotoxins ...

PORTLAND, Ore. (KOIN) – A safety advisory has been issued for anyone planning to visit the Ross Island Lagoon or a part of the Willamette River from the Ross Island Bridge downriver to Wapato Bridge ...

PORTLAND Ore. (KPTV) - Dozens spent the morning picking berries on Ross Island in the Willamette River - an activity locals say they could lose if the toxic algae that blooms in the river each year ...

A state advisory warning of a harmful algal bloom expanded Wednesday to include much of the Willamette River running through Portland in what has become a common summer alert in the city. The Oregon ...

We share the freshwater species living in Oregon’s Willamette River and describe where to find them and how they live.