Michael B. Bolger, Ph.D.

Daily Graph of Russian River Low Flow Toxicity

Click here for a Periodic Blog on Observed Cyanotoxin levels and Factors that influence Russian River Toxicity

IMPORTANT DISCLAIMER: The prediction of anatoxin concentrations and the risk of toxicity to humans and animals presented on this web page should not be used to make decisions about personal safety or the use of Russian River recreation opportunities. These predictions are based on a simple mathematical relationship between river water temperature, river flow, and air temperature that will never be absolutely accurate. My intention for the publication of this model is to help the Sonoma County Water Agency and the Sonoma County Board of Supervisors to exercise adaptive management of Russian River flow and thus avoid the bloom of blue-green algae and potential river toxicity.

Sonoma County residents: Feel free to check this web site as often as you'd like to see the predicted Anatoxin-a concentration in Russian River. This simulation model does not provide specific geographical locations along the river for these predictions. The model uses daily river flow data from the gauge at Hacienda, water temperature at 3:00 PM in Guerneville. and air temperature also from Guerneville. If you'd like more detailed information about the equations used and background of the model development you can download the following report. Report on Water Quality, Draft EIR, and Simulation Model
Click here for a plot of the predicted change in daily anatoxin concentration
Please don't let the Sonoma County Board of Supervisors (SCBOD) ignore this easily avoidable and potentially life-threatening Russian River blue-green algae related toxicity! Encourage your supervisor and the Sonoma County Water Agency (SCWA) to adopt adaptive management of Russian River flows. Let's use an advanced computer model to predict when to expect a bloom of blue-green algae and the subsequent increase in cyanotoxin levels, and then adjust the river flow to easily avoid the potential toxicity.
Click here to see a blowup for just the summer of 2018.

NOTE: I have confirmed with the Sonoma County Department of Health that they did not conduct sampling in the month of July 2018. Consequently, the observed levels are zero even though the predicted levels are significant.
NOTE: The July 30th, August 6th, and August 13th observed levels were for microcystin at Camp Rose and Steelhead beaches.

My recommendation is for Sonoma County Residents to contact your supervisor and encourage them to instruct SCWA to utilize this type of simulation model to manage the Russian River flows when the conditions of flow, water temperature, and air temperature could give rise to this type of toxicity.
Here is a link to the Sonoma County Dept. of Health Services web page for current data on Blue-Green Algae and cyanobacteria:
SCDHS Blue-Green Algae

Thanks, Mike
If you have questions, you can E-mail me at:

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