Current Cyanobacteria Advisories

The table below is continually updated with the most current information on recreational use health advisories issued and lifted throughout the season for monitored and sampled water bodies.

Remember: Only a fraction of all water bodies in Oregon are visually monitored or sampled due to limited physical and monetary resources. A water body with no recreational health advisory is not an indication that a bloom is not present. You are your own best advocate when ensuring your safety, and that of your family and pets. Be aware and "when in doubt, stay out."

= Advisory in effect lifted = Advisory has been lifted = Permanent advisory

Waterbody	Status	Link	County	Toxin	Data (ppb)
Willow Creek Reservoir	= Advisory has been lifted	January 3, 2023	Morrow	Microcystin	995 ppb
Willamette River between Willamette Cove and Cathedral Park	= Advisory has been lifted	September 16, 2022	Multnomah	Microcystin	9 ppb
Hells Canyon Reservoir	= Advisory has been lifted	November 8, 2022	Wallowa and Baker	Cyanobacteria	n/a
Brownlee Reservoir	= Advisory has been lifted	November 8, 2022	Baker	Cyanobacteria	n/a
Cronemiller Lake in Benton County	= Advisory has been lifted	August 3, 2022	Benton	Cyanobacteria	n/a
Upper Klamath Lake	= Advisory has been lifted	December 15, 2022	Klamath	Microcystin	61 ppb
South Umpqua River and mainstem Umpqua River	Permanent Recreational Use Advisory	Posted Sign	Douglas

Douglas County Permanent Recreational Use Advisory: South Umpqua River and mainstem Umpqua River

The advisory covers the South Umpqua River from Canyonville downstream to the confluence with the mainstem Umpqua River, and the mainstem Umpqua River downstream past Elkton to Lawson Bar. Pools in the bedrock along the rivers edge are known to develop cyanobacteria (blue-green algae) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted at several access areas along the river.