Rye Patch State Recreation Area (Updated May 27, 2026)
Rye Patch Reservoir, located in Rye Patch State Recreation Area, has been placed under a HAB Watch Advisory due to a possible Harmful Algae Bloom. Visual assessments have indicated a possible bloom. Water tests are currently being conducted by the Nevada Division of Environmental Protection (NDEP). These toxic algae can cause serious health issues for humans and animals.
Marlette Lake (Updated June 17, 2026)
Marlette Lake, located in Spooner Lake & Backcountry State Park, has been placed under a HAB Watch Advisory due to a possible Harmful Algae Bloom. Visual assessments have indicated a possible bloom. These toxic algae can cause serious health issues for humans and animals.
Washoe Lake (Updated July 20, 2026)
Washoe Lake, located in Washoe Lake State Park, has been placed under a HAB Watch Advisory due to a possible Harmful Algae Bloom. Visual assessments have indicated a possible bloom. These toxic algae can cause serious health issues for humans and animals.
None at this time.
Lahontan State Recreation Area (Updated August 20, 2026)
Lahontan Reservoir, located within Lahontan State Recreation Area, has been placed under a HAB Danger Advisory due to high levels of cyanotoxins detected in recent water samples collected from the reservoir. This is the highest level of HAB advisory and should be taken seriously.
Water contact is not recommended. Children and pets should stay away from water bodies under a HAB Danger Advisory.
HAB conditions can change rapidly, and the movement and concentration of blooms can be unpredictable. The Nevada Division of Environmental Protection (NDEP) is monitoring the situation closely.
Exposure to cyanotoxins can cause health effects ranging from mild skin irritation to serious illness and, in rare circumstances, death. Symptoms may include skin rashes or irritation, respiratory or allergic-like reactions, abdominal pain, headache, vomiting, diarrhea, and neurological symptoms. Severe exposure may result in liver or kidney damage.
