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)
Upper Klamath Lake (Howard's Bay & Surrounding Areas)	Recreational Ue Advisory ISSUED	9/29/2020	Klamath	MIcrocystin	99
Upper Klamath Lake(Moore Park & Surrounding Areas)	Recreational Use Advisory LIFTED	9/29/2020	Klamath	Microcystin	100
Willow Creek Reservoir	Recreational Use Advisory ISSUED	9/3/2020	Morrow	Microcystin	12.8
Odell Lake	Recreational Use Advisory LIFTED	8/10/2020	Klamath	Microcystin	1710
North Tenmile Lake	Recreational Use Advisory LIFTED	1/10/2020	Coos	Microcystin	8.43
South Lake at Tenmile Lake	Recreational Use Advisory LIFTED	1/10/2020	Coos	MIcrocystin	32.49
South Umpqua River and Lawson Bar	Permanent Recreational Use Advisory	Posted Sign	Douglas

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