Blue-Green Algae Tracker
Current Posting Status:
November 13th, 2013 - Copco Reservoir (6/16/13) have been posted under California's Recommended Threshold for Recreational Waters for Harmful Algae Blooms. Please refer to the notification section of this webpage for additional information.
Blue-green Algae Tracker
Click on the map above to view posted public access locations in your area.
About the Tracker
The Tracker was built to inform the public and research community regarding river conditions. The Tracker utilizes current information to track and map the blue-green algae blooms throughout the Klamath Basin. The Blue-Green Algae Tracker identifies blue-green algae public health threats (i.e. exceeds health thresholds identified in the statewide voluntary guidance) by river segment bounded by public health monitoring locations. Areas that present a threat to public health are highlighted in RED.
In the Klamath Basin blue-green algae blooms typically occur between June and October when temperatures rise and water conditions are favorable for algal growth. Blue-green algae monitoring typically occurs May - November. If river conditions exceed public health standards for toxic algae the area is posted with a health advisory sign. More Information
*Posting Guidelines - Updated July 2010 - Report (pdf)
The California State Water Resources Control Board (SWRCB), California Department of Public Health (CDPH), California's Office of Environmental Health and Hazard Assessment (OEHHA), and Oregon Department of Health Services (ODHS) provide guidelines for posting advisories in recreation waters. These guidelines were developed using information provided in World Health Organization. Both SWRCB and ODHS recommend posting advisories in recreation waters under four circumstances: (1) if "scum is present associated with toxigenic species"; (2) if scum is not present, but the density of Microcystis or Planktothrix is 40,000 cells/ml or greater; (3) if scum is not present, but the density of all potentially toxigenic BGA is 100,000 cells/ml or greater; and (4) If the concentration of total microcystin is greater or equal to 8 ppb or if anatoxin-a is detected.
Posting Removal Guidelines - Updated July 2010
This general approach may be useful in determining when to lift warning advisories:
• If posting occurred due to visible scum – wait two weeks (there should be no visible scum recurrence during this time) before lifting the advisory.
• If posting occurred due to exceeding a cell count guideline – wait two weeks after cell count falls below the recommended guideline (there should be no visible scum recurrence during this time) before lifting the advisory.
• If posting occurred due to exceeding a toxin concentration guideline – wait 1 week after the toxin concentration falls below the recommended guideline (there should be no visible scum recurrence during this time) before lifting the advisory.
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