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