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.
View the Klamath BGA Tracker Interactive Map
For more information, please check California's HAB Incident Reports Map.
join the Klamath Blue Green Algae Workgroup list serve.
Updated Posting Status
12/18/23- All reservoirs and reaches of the Klamath River are below public health thresholds for cyanotoxins.
About the Tracker
The BGA Tracker Map 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 appropriate guidance) by river reaches bounded by public health monitoring locations.
River reaches which exceed applicable criteria for public health are indicated by different colors on the map that vary depending on the number of tiers within each jurisdiction's advisory thresholds. Advisory colors within the map are:
Blue-green Algae Official Notifications