Cyanobacteria Advisory Archive

The Harmful Algae Bloom Surveillance (HABS) program keeps an archive of recreational use health advisories issued each year since water sampling began. Browse the list below for data by year.

View current advisories

Waterbody	Status	Link	County	Toxin	Data (ppb)
Brownlee Reservoir	= Advisory has been lifted	December 1, 2023	Baker (issued by State of Idaho)	Microcystin
Willow Creek Reservoir	= Advisory has been lifted	November 22, 2023	Morrow	Microcystin	46.3
Lake Ewauna	= Advisory has been lifted	November 7, 2023	Klamath	Microcystin	12
Agency Lake	= Advisory has been lifted	November 7, 2023	Klamath	Microcystin	16.3
Upper Klamath Lake	= Advisory has been lifted	November 7, 2023	Klamath	Microcystin	150
Hells Canyon Reservoir	= Advisory has been lifted	September 27, 2023	Wallowa & Baker (Issued by State of Idaho)	Microcystin
Willamette River in Portland	= Advisory has been lifted	September 28, 2023	Multnomah	Microcystin	38.1
Aarons Lake	= Advisory has been lifted	September 14, 2023	Columbia	Anatoxin-a	369
Pete's Slough & Sturgeon Lake	= Advisory has been lifted	August 25, 2023	Columbia & Multnomah	Microcystin	406
Cullaby Lake	= Advisory has been lifted	August 21, 2023	Clatsop	Cyanobacteria	Visible bloom
Galesville Reservoir	= Advisory has been lifted	June 30, 2023	Douglas	Cyanobacteria	Visible bloom
South Umpqua River and mainstem Umpqua River	Permanent Recreational Use Advisory	Posted Sign	Douglas

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

Waterbody	Status	Link	County	Toxin	Data (ppb)
Malheur Reservoir	Recreational Use Advisory LIFTED	November 5, 2021	Malheur	Anatoxin-a	8.59
Ross Island Lagoon and Holgate Channel of Willamette River	Recreational Use Advisory LIFTED	October 12, 2021	Multnomah	Microcystin	550
Upper Klamath Lake (ENTIRE LAKE)	Recreational Use Advisory LIFTED	November 2, 2021	Klamath	Microcystin	910
JC Boyle Reservoir	Recreational Use Advisory LIFTED	September 28, 2021	Klamath	Microcystin	18
South Umpqua River and mainstem Umpqua River	Permanent Recreational Use Advisory	Posted Sign	Douglas

Waterbody	Status	Link	County	Toxin	Data (ppb)
Willow Creek Reservoir	Recreational Use Advisory LIFTED	11/30/2020	Morrow	Microcystin	12.8
Upper Klamath Lake (All Areas)	Recreational Use Advisory LIFTED	1/5/2021	Klamath	Microcystin	22-26
Upper Klamath Lake (Howard's Bay & Surrounding Areas)	Recreational Use Advisory UPDATED	11/4/2020	Klamath	MIcrocystin	99
Upper Klamath Lake(Moore Park & Surrounding Areas)	Recreational Use Advisory LIFTED	9/29/2020	Klamath	Microcystin	100
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

Waterbody	Status	County
Lake Billy Chinook	11/8/2019 Precautionary Seasonal Advisory LIFTED	Jefferson
Cullaby Lake	10/3/2019 Recreational Use Advisory LIFTED	Clatsop
Brownlee Reservoir	9/12/2019 Idaho DEQ Advisory LIFTED	Washington (Idaho)
Hells Canyon Reservoir	9/27/2019 Idaho DEQ Advisory LIFTED	Washington (Idaho)
Lake Selmac	10/25/2019 Recreational Use Advisory LIFTED	Josephine
Odell Lake	8/14/2019 Recreational Use Advisory LIFTED	Klamath
Upper Klamath Lake	10/3/2019 Recreational Use Advisory LIFTED	Klamath
Willow Creek Reservoir	10/25/2019 Recreational Use Advisory LIFTED	Morrow
South Umpqua River and Lawson Bar	Permanent Advisory	Douglas

Waterbody	Status	County	Dominant genus / toxin	Cell count/Toxin
Keno Dam Reservoir	LIFTED November 27, 2018	Klamath	Microcystin	4.7 ppb
Willow Creek Reservoir	LIFTED September 17, 2018	Morrow	MIcrocystin	102 ppb
Cullaby Lake	LIFTED September 14, 2018	Clatsop	Microcystin	13.15 ppb
Ross Island Lagoon In Willamette River	LIFTED August 24, 2018	Multnomah	Microcystin	3.92 parts per billion (ppb)
Detroit Lake Logboom & Big Cliff Lake	LIFTED August 16, 2018	Linn-Marion	Microcystin	> 5 ppb
Odell Lake	LIFTED August 8, 2018	Klamath	Microcystin	98 ppb
Lake Billy Chinook	LIFTED July 19, 2018	Jefferson	Microcystin	9.54 ppb
Dorena Reservoir	LIFTED June 22, 2018	Lane	Dolichospermum	1,200,000 cells/mL
Upper Klamath Lake	LIFTED July 31, 2018	Klamath	Microcystin	33 ppb
South Umpqua River	Permanent	Douglas	Anatoxin-a

Detroit Lake	June 2, 2017	June 16, 2017	Marion	cylindrospermopsin	213 parts per billion
South Tenmile Lake	June 12, 2017	June 16, 2017	Coos	Visual bloom present
Odell Lake	July 24, 2017	August 2, 2017	Klamath	Microcystins	29.5 parts per billion
Areas of Lake Billy Chinook	June 30, 2017	Sept 8, 2017	Jefferson	Microcystin	27.1 parts per billion
Upper Klamath Lake	June 7, 2017	June 20, 2017	Klamath	Microcystin	15 parts per billion
Drews Reservoir	June 30, 2107	Sept. 27, 2017	Lake	Microcystin	10 parts per billion
Brownlee Reservoir: Idaho DEQ	July 28, 2017	Sept. 14, 2017	Baker
Willow Creek Reservoir	August 7, 2017	October 27, 2017	Morrow	Microcystin	10 parts per billion
Agency Lake	August 7, 2017	November 2, 2017	Klamath	Microcystin	27.1 parts per billion
Link and Klamath rivers to J.C. Boyle Dam	Updated Oct. 9, 2017	November 2, 2017	Klamath	Microcystin	16 ppb
All of Upper Klamath Lake (Update of Howard & Shoalwater Bay advisory	Updated Sept. 1, 2017	November 17, 2017	Klamath	Microcystin	8,800 parts per billion
Howard Bay, Upper Klamath Lake	July 28, 2017	Updated August 8, 2017	Klamath	Microcystin	12 parts per billion

Waterbody	Issued	Lifted	County	Dominant genus / toxin	Cell count/Toxin
Upper Klamath Lake, Howard Bay	June 24, 2016	September 16, 2016	Klamath	microcystin	14 ppb
Lake Billy Chinook - Metolius arm	July 1, 2016	July 15, 2016	Jefferson	microcystin	10,450 ppb
Lake Billy Chinook - Metolius and Crooked arms	July 8, 2016	July 15, 2016	Jefferson	microcystin	135 ppb
Agency and Upper Klamath Lakes	July 8, 2016	July 28, 2016	Klamath	mycrocystis	15 ppb
Odell Lake	July 28, 2016	August 12, 2016	Klamath	microcystin	338 ppb
Agency Lake	August 19, 2016	December 16, 2016	Klamath	microsystin	32,000 ppb
Ross Island Lagoon	August 19, 2016	September 1, 2016	Multnomah
Blue Lake	September 7, 2016	September 16, 2016	Multnomah	microcystin
Upper Klamath Lake, Howard Bay	October 3, 2016	November 7, 2016	Klamath	microcystis	1,077,630 cells/mL

Eight advisories were issued in 2015. The bloom season began in May and extended through October.

Waterbody	Issued	Lifted	County	Dominant genus / toxin	Cell count/Toxin
Detroit Reservoir	May 15, 2015	May 21, 2015	Linn/Marion	Cylindrospermopsin	38.9 ppb
Lake Billy Chinook Reservoir	June 25, 2015	July 1, 2015	Jefferson	Microcystin	22.5 ppb
Willamette River Ross Island Lagoon	July 9, 2015	October 1, 2015	Multnomah	Microcystis, Dolichospermum and Cylindrospermopsis	Klamath
Upper Klamath and Agency Lakes (excluding Pelican Bay)	July 28, 2015	Klamath	Klamath	Microcystin	12 ppb
Upper Klamath and Agency Lakes (extended downstream to Keno Dam)	July 29, 2015	October 27, 2015	Klamath	Microcystin	14 ppb
Upper Klamath and Agency Lakes (lifted below JC Boyle Reservoir to California border)	August 5, 2015	August 14, 2015	Klamath	Microcystin	470 ppb
Clackamas Cove	September 28, 2015	November 4, 2015	Clackamas	Anabaena planctonica	457, 360 cells per milliliter
Willow Creek Reservoir	October 13, 2015	October 27, 2015	Morrow	Microcystin	354 ppb

The 2014 bloom season extended from June 2014 into February 2015. Ten advisories were issued that were in effect for a total of 456 days (advisory-days). Get complete details in the 2014 Bloom Season Recap.

Douglas County: South Umpqua River and Lawson Bar

A permanent health advisory is in place for the pools of water that form in the bedrock along the rivers edge. These pools are known to develop cyanobacterial (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 Permanent Umpqua River Sign (.jpg)

2014 Advisory Listing

Waterbody	County	Dominant species / toxin	Cell count/ level	Issued (start date)	Lifted (end date)
Lost Creek Lake	Jackson	Anabaena flos-aquae	3,222,251 cells/mL	6/3/2014	6/26/2014
Odell Lake	Klamath	Microcystin	675 parts per billion (ppb)	7/21/2014	8/8/2014
Devils Lake	Lincoln	Microcystin	>25 ppb	8/1/2014	11/25/2014
Walterville Pond	Lane	Microcystis	53,000 cells/mL	8/5/2014	10/2/2014
Tenmile Lakes	Coos	Microcystin	107 ppb	9/15/2014	11/25/2014
Willamette River	Multnomah	Microcystis	2.25 million cells/mL	9/16-19/2014 Expanded	10/2/2014
Wickiup Reservoir	Deschutes	Microcystin	20.6 ppb	9/19/2014	11/10/2014
Cullaby Lake	Clatsop	Cylindrospermopsin & Microcystin	12 ppb & 16 ppb	9/22/2014	10/3/2014
Willow Creek Reservoir	Morrow	Microcystis	1,777,664 cells/mL	10/10/2014	11/18/2014
Lost Creek Lake	Jackson	Anabaena flos-aquae	197,629 cells/mL	12/4/2014	2/26/2015

The 2013 bloom season extended from June 2013 into January, 2014. Twelve advisories were issued that were in effect for a total of 731 days (advisory-days). Get complete details in the 2013 Bloom Season Recap.

2013 was the last season for the Harmful Algae Bloom Surveillance program as CDC funding ceased on September 30, 2013. Although many of the activities performed by the program can no longer be sustained, there are certain activities that OHA has committed to continue, such as; the issuing and lifting of advisories, receiving and documenting illnesses, and updating advisory outreach venues like this.

This map displays the location of each advisory (in sequence). See the table below for detailed information, including links to the original advisories. Links are displayed by the date an advisory was issued (start date) or lifted (end date).

2013 Advisory Listing

Waterbody	County	Dominant Species/Toxin	Cell Count/Level	Start Date	End Date
Willow Creek Reservoir	Morrow	Anabaena flos-aquae	3,551,625	6/18/2013	8/13/2013
Lost Creek Lake	Jackson	Anabaena flos-aquae	1,175,333	6/20/2013	7/05/2013
Dexter Reservoir	Lane	Anabaena flos-aquae	2,228,000	7/03/2013	9/19/2013
Dorena Reservoir	Lane	Anabaena flos-aquae	556,000	7/25/2013	9/24/2013
Devils Lake	Lincoln	Microcystis	Unknown	8/01/2013	11/21/2013
Blue Lake	Multnomah	Visible Scum	Unknown	8/06/2013	8/09/2013
Fern Ridge Reservoir	Lane	Visible Scum	Unknown	8/15/2013	12/18/2013
Blue Lake	Multnomah	Visible Scum	Unknown	9/09/2013	9/13/2013
Lost Creek Lake	Jackson	Anabaena flos-aquae	1,032,975	9/13/2013	12/30/2013
Walterville Pond	Lane	Microcystis	46,000	9/13/2013	10/3/2013
Tenmile Lakes	Coos	Microcystis	Unknown-high toxins	10/04/2013	12/03/13
Willow Creek Reservoir	Morrow	Anabaena flos-aquae	1,104,950	10/25/2013	1/21/2014

The 2012 bloom season extended from July into January, 2013. Nine advisories were issued that were in effect for a total of 601 days (advisory-days). This was the first season toxin based monitoring (TBM) was used by some waterbody managers to determine if an advisory should be issued once a bloom is identified. Initial TBM of a bloom allows managers to avoid advisories on monitored recreational waters if toxins produced by the cyanobacteria are below guideline values. TBM is conducted every other week throughout the life of the bloom to ensure toxins continue to stay below harmful levels. Cell counts and toxin analysis are still required for all advisories to be lifted. Use of TBM reduced the number of advisories from 18 in 2011 to nine in 2012. Get complete details in the 2012 Bloom Season Recap

Waterbody	County	Dominant Species/Toxin	Cell Count/Level	Start Date	End Date
Jackson Creek	Jackson	Aphanizomenon flos-aquae	157,850	7/12/2012	7/17/2012
Walterville Pond	Lane	Anabaena flos-aquae	800,000	7/27/2012	8/23/2012
Dorena Reservoir	Lane	Anabaena sp.	171,000	7/31/2012	10/23/2012
Dexter Reservoir	Lane	Anabaena sp.	231,000	8/13/2012	11/16/2012
Blue Lake	Multnomah	Microcystis aeruginosa	397,732	8/28/2012	9/14/2012
Willow Creek Reservoir	Morrow	Anabaena flos-aquae	27,060,000	9/14/2012	12/27/2012
Lost Creek Reservoir	Jackson	Anabaena flos-aquae	405,900	9/18/2012	1/24/2013
Big Creek Reservoir	Lincoln	Microcystis aeruginosa	312,500	9/18/2012	12/24/2012
Fern Ridge Reservoir	Lane	Microcystis sp.	2,156,000	9/21/2012	11/14/2012

The 2011 bloom season extended from June into February, 2012. Eighteen advisories were issued that were in effect for a total of 1,175 days (advisory-days). This was the first season that had an added requirement to test for both cell counts and toxins before an advisory could be lifted. Get complete details in the 2011 Bloom Season Recap (pdf).

Waterbody	County	Dominant Species	Start Date	End Date
Cougar Reservoir	Lane	Anabaena	6/14/2011	7/19/2011
Lost Creek Lake	Jackson	Anabaena	6/20/2011	7/11/2011
Cullaby Lake	Clatsop	Aphanizomenon	7/1/2011	9/01/2011
Fish Lake	Jackson	Anabaena	7/1/2011	7/25/2011
Willow Creek Reservoir	Morrow	Anabaena	7/11/2011	8/8/2011
Diamond Lake	Douglas	Anabaena	7/29/2011	8/9/2011
S. Umpqua River, near Myrtle Creek	Douglas	Microcystis	7/29/2011	1/09/2012
Dexter Reservoir	Lane	Anabaena	8/19/2011	10/14/2011
Gerber Reservoir	Klamath	Aphanizomenon	8/23/2011	1/31/2012
Sru Lake	Coos	Anabaena	8/24/2011	2/07/2012
South Tenmile Lake	Coos	Aphanizomenon	8/25/2011	11/21/2011
Lemolo Lake	Douglas	Anabaena	8/31/2011	9/19/2011
Willow Creek Reservoir	Morrow	Aphanizomenon	9/7/2011	11/09/2011
North Fork Reservoir	Clackamas	Anabaena	9/8/2011	9/23/2011
Timothy Lake	Clackamas	Anabaena	9/8/2011	9/23/2011
Dorena Reservoir	Lane	Gloeotrichia	9/19/2011	10/24/2011
Fall Creek Reservoir	Lane	Gloeotrichia	9/20/2011	12/30/2011	101
Lost Creek Lake	Jackson	Aphanizomenon	9/23/2011	1/11/2012

The 2010 bloom season extended from April into January, 2011. Twenty-two advisories were issued that were in effect for a total of 1,412 days (advisory-days). The number of advisories increased from six in 2005 to 22 in 2010. The increase may indicate that cyanobacteria blooms are increasing in severity but may also reflect enhanced surveillance efforts among local, state and federal partners. Get complete details in the 2010 Bloom Season Recap (pdf)

Waterbody	County	Start Date	End Date
Willow Lake	Jackson	4/21/2010	8/19/2010
Lost Cr Lake	Jackson	6/04/2010	6/22/2010
Lemolo Lake	Douglas	7/01/2010	8/02/2010
Diamond Lake	Douglas	7/15/2010	8/03/2010
Willow Creek Reservoir	Morrow	7/15/2010	11/05/2010
Fish Lake	Douglas	7/19/2010	8/23/2010
Fairview Lake	Multnomah	7/27/2010	1/18/2011
Haystack Reservoir	Jefferson	8/04/2010	12/13/2010
Golden Gardens Pond	Lane	8/05/2010	10/14/2010
Fish Lake	Jackson	8/09/2010	8/23/2010
Dexter Reservoir	Lane	8/11/2010	9/20/2010
Gerber Reservoir	Klamath	8/19/2010	12/01/2010
Whetstone Pond	Jackson	8/24/2010	9/9/2010
South Umpqua River Lawson Bar area	Douglas	8/24/2010	12/08/2010
Blue Lake	Multnomah	8/26/2010	10/05/2010
Sru Lake	Coos	8/30/2010	10/05/2010
North Fork Reservoir	Clackamas	9/2/2010	9/14/2010
Dorena Reservoir	Lane	9/10/2010	10/04/2010
Blue River Reservoir	Lane	9/10/2010	10/05/2010
Lost Creek Lake	Jackson	9/20/2010	1/14/2011
Tenmile Lake	Coos	9/23/2010	1/13/2011
Willow Lake	Jackson	10/12/2010	10/15/2010

The 2009 algae bloom season extended from May to December. Twenty-one heath advisories were issued that were in effect for a total of 727 days (advisory-days). The number of public health advisories issued per year has increased from six in 2005 to 21 advisories in 2009. Get complete details in the 2009 Bloom Season Recap (pdf).

Waterbody	County	Start Date	End Date
Hill Creek Reservoir	Lane	5/21/2009	6/16/2009
Lost Creek Lake	Jackson	6/15/2009	6/29/2009
Crane Prairie Reservoir	Deschutes	6/18/2009	7/09/2009
Odell Lake	Klamath	7/22/2009	8/12/2009
Whetstone Pond	Jackson	7/23/2009	9/09/2009
Lemolo Lake	Douglas	7/23/2009	8/18/2009
Hill Creek Reservoir	Lane	7/30/2009	8/31/2009
Devils Lake	Lincoln	7/31/2009	9/08/2009
Crane Prairie Reservoir	Deschutes	7/31/2009	8/12/2009
Wickiup Reservoir	Deschutes	8/12/2009	8/31/2009
Dexter Reservoir	Lane	8/13/2009	9/28/2009
Dorena Reservoir	Lane	8/13/2009	10/23/2009
Paulina Lake	Deschutes	8/27/2009	9/21/2009
Wickiup Reservoir	Deschutes	9/02/2009	9/25/2009
Elk Creek @ Umpqua River	Douglas	9/04/2009	9/22/2009
Sru Lake	Coos	9/09/2009	11/30/2009
Willow Creek lake	Morrow	9/11/2009	10/19/2009
Tenmile Lake	Coos	9/18/2009	11/30/2009
Haystack Reservoir	Jefferson	9/18/2009	11/02/2009
Lost Creek Lake	Jackson	9/18/2009	10/13/2009
Blue Lake	Multnomah	10/14/2009	11/06/2009

Waterbody	County	Start Date	End Date
Hill Creek Lake	Lane	05/15/2008	07/16/2008
Willow Creek Lake	Morrow	07/02/2008	08/20/2008
Lemolo Lake	Douglas	07/10/2008	08/27/2008
Tualatin River	Washington/Clackamas	07/12/2008	07/25/2008
Odell Lake	Klamath	08/07/2008	08/22/2008
Devils Lake	Lincoln	08/14/2008	11/03/2008
Dorena Reservoir	Lane	08/22/2008	09/24/2008
Willow Creek Lake	Morrow	09/10/2008	12/23/2008
Wickiup Reservoir	Deschutes	09/11/2008	09/25/2008
Lost Creek Lake	Jackson	09/15/2008	01/27/2009
Dexter Reservoir	Lane	09/18/2008	10/22/2008
Lemolo Lake	Douglas	09/18/2008	10/15/2008
Wickiup Reservoir	Deschutes	10/02/2008	10/27/2008
Siltcoos Lake	Lane	10/28/2008	01/29/2009

Waterbody	County	Start Date	End Date
Hill Creek Lake	Lane	05/11/2007	06/06/2007
Detroit Lake	Marion	05/30/2007	06/13/2007
Lost Creek Lake	Jackson	06/12/2007	07/10/2007
Willow Creek Lake	Morrow	06/22/2007	08/03/2007
Lemolo Lake	Douglas	06/26/2007	08/20/2007
Odell Lake	Klamath	07/25/2007	08/13/2007
Willow Creek Lake	Morrow	08/17/2007	10/31/2007
Siltcoos Lake	Lane	09/18/2007	11/09/2007

Cyanobacteria Advisory Archive

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

Douglas County: South Umpqua River and Lawson Bar

2014 Advisory Listing

2013

2013 Advisory Listing

2012

2011

2010

2009

2008

2007