KBMP Vision
The Klamath Basin Monitoring Program facilitates the coordination and implementation of water quality monitoring in support of the stewardship, protection, and restoration of all beneficial uses within the Klamath River watershed, with the ultimate goal of restoring water quality. Learn More
Blue-Green Algae Map
Upper Klamath Lake, Copco Reservoir, the Scott River, and the Klamath River between Orleans and Weitchpec are currently posted
Fish Health
Readiness Level
Mainstem Klamath- Iron Gate to Happy Camp- Yellow
All other Reaches- Green
Real-Time Data
The table above contains provisional data provided by the USGS via the waterservices site. All data are provisional and may be recalculated before final approval. This table may take several seconds to load.
* = value 2+ hours old
**=4 or more hours
Blue-Green Algae Tracker
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.
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Updated Posting Status
December 2, 2020- The Klamath River from Weitchpec to the mouth has been deposted based on sample results collected in late October and November from numerous locations in the lower Klamath River, increased flows, and the end of the monitoring season. As of December 2nd, 2020, the health advisory for this waterbody has been lifted.
December 1, 2020- The Klamath River from Iron Gate Reservoir to Orleans has been deposted. Sample results collected in late October and November from numerous locations in Iron Gate Reservoir and the mainstem Klamath River meet the State of California’s Recommended Threshold for Recreational Waters for harmful algae blooms. As of December 1st, 2020, the health advisory for this waterbody has been lifted.
November 30, 2020- The Copco Reservoir posting for microcystin has decreased from Danger to Caution. Sample results collected in late October and November from Copco Reservoir show diminishing levels of Microcystin that warrant a reduction in the posting threshold. As of November 30th, 2020, the health advisory for this waterbody has decreased from Danger to Caution.
October 30, 2020- The Klamath River from Weitchpec to the mouth has been posted at the Warning Level 2 due to microcystin. This extends the previous posting from Weitchpec to Turwar on August 28th.
September 30, 2020- The Upper Klamath Lake advisory from Sept 16th for Moore Park and surrounding areas has been expanded to the entire lake due to additional microcystin sampling data and the unpredictability of cyanobacteria blooms.
September 18, 2020- Scott River at Indian Scotty Campground and Jones Beach have been posted due to the presence of benthic cyanobacteria and Anatoxin-a. Please avoid contact with algae mats.
September 16, 2020- Upper Klamath Lake near Moore Park has been posted due to microcystin. This advisory is for Moore Park and closely surrounding areas.
August 28, 2020- The Klamath River from Weitchpec to Turwar has been posted at the Warning Level 2 due to the detection of Anatoxin-A.
July 13, 2020- Copco and Iron Gate Reservoirs have been posted at the Danger level.
July 13, 2020- The Klamath River from Iron Gate to Weichepec has been posted at the Caution Action Trigger level.
July 10, 2020- The Klamath River from Weichpec to the Estuary has been posted at the Caution level due to very low level detections of microcystin found in samples collected on July 7th and 8th at all mainstem Klamath sites on the Yurok Reservation. These are below the health threshold of concern but please use caution.
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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:
Oregon
California 

Yurok Tribe

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Blue-green Algae Official Notifications