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

Toxin                 Data (ppb)
Willow Creek Reservoir lifted Recreational Use Advisory LIFTED

11/30/2020Morrow Microcystin             12.8
Upper Klamath Lake
(All Areas)
Recreational Use Advisory
Upper Klamath Lake (Howard's Bay & Surrounding Areas) Recreational Use Advisory UPDATED
KlamathMIcrocystin             99

Upper Klamath Lake(Moore Park & Surrounding Areas)

liftedRecreational Use Advisory LIFTED

9/29/2020KlamathMicrocystin            100

Odell Lake

lifted Recreational Use Advisory LIFTED
 Microcystin             1710
North Tenmile Lake

liftedRecreational Use Advisory  LIFTED

Microcystin             8.43 
South Lake at Tenmile Lake
liftedRecreational Use Advisory LIFTED
MIcrocystin             32.49
South Umpqua River and Lawson Bar permanentPermanent Recreational Use Advisory Posted SignDouglas

permanent 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.

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