09/05/2026
Please see the notice for an cyanobacteria health advisory from Idaho Department of Enviromental Quality for Ririe Reservoir.
A cyanobacteria health advisory has been issued for Ririe Reservoir in Bonneville County. People and pets should stay out of the water. Cyanobacteria harmful algal blooms (HABs) pose a high risk to the health of pets and livestock and can cause illness in humans, especially small children.
Cyanobacteria are a natural part of Idaho’s waterbodies, but when conditions are right, they can multiply rapidly, or “bloom,” and release toxins into the water. Exposure to cyanotoxins through skin contact or ingestion can cause skin irritation, upset stomach, and more serious symptoms. Effects can be more serious in animals since they are more likely to drink the water.
Blooms don’t all look the same; they may look like mats, foam, spilled paint, or surface scum and have a foul odor. Use caution when recreating in and around water. When in doubt, stay out and keep pets out of the water.
Learn more about cyanobacteria blooms and how to report a potential bloom on the Idaho Department of Environmental Quality website at https://www.deq.idaho.gov/water-quality/surface-water/cyanobacteria-harmful-algal-blooms/
Bonneville County Sheriff's Office
Bonneville County Idaho
City of Idaho Falls
City of Ririe
Eastern Idaho Public Health
Idaho Department of Health and Welfare
