KLAMATH COUNTY, Ore. — The Oregon Health Authority (OHA) has issued a recreational use health advisory for Odell Lake after water samples collected from the lake tested above safe levels for cyanotoxins, prompting officials to warn visitors to avoid activities that could result in swallowing or inhaling contaminated water.
The advisory, issued Tuesday, July 28, follows a recreational use health precaution that has been in place since July 24 after a visible harmful algae bloom was observed on the lake.
According to OHA, people should avoid swimming and other water activities in areas where algae blooms are present if there is a risk of swallowing water or inhaling water spray. While cyanotoxins are not absorbed through the skin, individuals with sensitive skin may develop a red, puffy rash after contact with affected water.
Health officials emphasized that the Recreational Use Values (RUVs) are designed to protect vulnerable populations, particularly children, who are more likely to swallow water while swimming and other recreational activities.
Despite the advisory, OHA said visitors can still safely enjoy many outdoor activities at Odell Lake, including fishing, camping, hiking, biking, picnicking, bird watching, canoeing and kayaking. Boating is also considered safe, provided operators avoid speeds that create excessive water spray, which could increase the risk of inhaling cyanotoxins.
Drinking Water Concerns
OHA warned that drinking untreated water directly from bloom-affected areas of the lake is especially dangerous. Cyanotoxins cannot be removed by boiling, standard water treatment methods, or camping-style water filters.
Visitors with questions about potable water at nearby campgrounds or day-use areas are encouraged to contact campground managers or local health officials. Residents who draw household water directly from affected portions of the lake are advised to use an alternative source for drinking and cooking, as not all private water treatment systems effectively remove cyanotoxins.
Health Risks for People and Pets
Children and pets face the greatest risk of exposure because they are more likely to ingest contaminated water.
Exposure to cyanotoxins in humans can cause symptoms ranging from stomach cramps, nausea, vomiting and diarrhea to more serious neurological effects such as numbness, tingling, dizziness and shortness of breath. Individuals experiencing severe symptoms should seek medical attention.
Dogs are particularly vulnerable and can become critically ill—or die—within minutes to hours after drinking contaminated water, licking algae from their fur or ingesting algae mats along the shoreline. Signs of poisoning include difficulty walking, seizures, lethargy and loss of appetite. Pet owners are urged to keep dogs leashed and away from affected water and algae, and to seek immediate veterinary care if symptoms develop.
Fishing Advisory
OHA also cautioned that fish caught in areas affected by harmful algae blooms may pose unknown health risks. Those who choose to eat fish from the lake are advised to remove the skin, fat and internal organs before cooking or freezing, as toxins are more likely to accumulate in those tissues. Fish fillets should also be rinsed with clean water before preparation.
Anyone with health concerns or who wishes to report a possible illness related to cyanotoxin exposure can contact the Oregon Health Authority at 971-673-0482.
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