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Algae Bloom Advisory Archive

pondThe Harmful Algae Bloom Surveillance (HABS) program keeps an archive of advisories that have been issued. Browse the list below for data by year.




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
​​

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