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Oregon Health Authority

Current Cyanobacteria Advisories

Current harmful algal bloom (HAB) recreational use health advisories are listed in the table below and displayed on the Oregon Harmful Algal Bloom Advisories map. Both the table and map are updated regularly with the latest information as advisories are issued and lifted throughout the season for monitored 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."

Click the buttons below to access the interactive Oregon Harmful Algal Bloom Advisories map: 

Advisory Map (English)  Mapa de Advertencia (Español)  Advisory Map (Mobile)  Mapa de Advertencia (Móvil)  

Report a suspected harmful algal bloom (HAB) or related illness: 

HAB Reporting Form  Animal Illness Reporting Form  Human Illness Reporting Form 

Advisory Levels

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

  • Advisory: Cyanotoxins have been confirmed through testing and are at unsafe levels, or a bloom has been sighted and water will be sampled within 1 business day. 
  • Precaution: A bloom has been sighted and water sampling is unavailable within 1 business day due to limited resources. 
  • Advisory Lifted: An 'Advisory' is lifted when water testing shows safe levels. If a site has previously tested at unsafe levels, regular testing continues until the bloom is visibly gone and cyanotoxins are at safe levels. A 'Precaution' is lifted when testing shows cyanotoxin levels are safe, or when the bloom is visibly gone. 


Waterbody 
Status
Date/Link 
County 
Toxin  Data   


Eckman Lake
Red.svgAdvisory
9/17/2024
Lincoln
Saxitoxin
24 ug/L
Powder Arm of Brownlee Reservoir (Cundiff Slough)
Red.svgAdvisory
9/5/2024
Baker
Microcystin
13.6 ug/L
North Santiam River
Blue.svgAdvisory Lifted
8/30/2024
Linn, Marion
Luckiamute Landing State Natural Area
Blue.svgAdvisory Lifted
9/9/2024
Linn
Devil's Lake
Blue.svgAdvisory Lifted
9/6/2024
Lincoln
Big Cliff Reservoir, Detroit Reservoir
Blue.svgAdvisory Lifted
9/5/2024
Linn, Marion
Microcystin
18.9 ug/L
Willow Creek Reservoir
Red.svgAdvisory
8/19/2024
Morrow
Microcystin
34 ug/L
Lake Billy Chinook, Lake Simtustus
Blue.svgAdvisory Lifted
8/16/2024
Jefferson
Wapato Marsh at
Oaks Bottom
Wildlife Refuge

Red.svgAdvisory
8/7/2024
Multnomah
Microcystin11.7 ug/L
Hells Canyon Reservoir
Red.svgAdvisory
8/5/2024
Baker & Wallowa (issued by State of Idaho)
Microcystin
> 50 ug/L
Brownlee Reservoir
Red.svgAdvisory
8/5/2024
Baker (issued by State of Idaho)
Microcystin
> 10 ug/L
Thief Valley Reservoir
Blue.svg Advisory Lifted
9/16/2024
Baker, Union


Cottonwood Reservoir
Blue.svgAdvisory Lifted
8/13/2024
Harney
Turner Lake
Blue.svg Advisory Lifted
7/25/2024
Marion
Fairview Lake
Blue.svgAdvisory Lifted
7/30/2024
Multnomah
McKay Reservoir
Blue.svgAdvisory Lifted 
7/25/2024
Umatilla


Cold Springs Reservoir
Blue.svgAdvisory Lifted 
7/25/2024
Umatilla
South Umpqua River and mainstream Umpqua River permanentPermanent Advisory Posted SignDouglas



Note: This table only includes health advisories for HABs affecting water bodies in the state of Oregon. To find advisories for water bodies in bordering states, please refer to the following websites:

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 Sawyers Rapids. 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.