PORTLAND, Ore.— June 30th: Oregon Health Authority (OHA) issued a recreational use health advisory today
for the southern portion of Upper Klamath Lake, from Howards Bay south to the Link River Dam, due to the
presence of a cyanobacteria bloom and cyanotoxins above recreational use values for human exposure. The
lake is in Klamath County.
People should avoid swimming and high-speed water activities, such as water skiing or power boating, in areas
of the lake where blooms are, as the major route of exposure is ingestion of water. Toxins are not absorbed
through the skin. However, those with skin sensitivities may get a puffy red rash.
OHA encourages people to visit Upper Klamath Lake and enjoy activities such as fishing, camping, hiking,
biking, picnicking, bird watching, canoeing, and kayaking. Boating is safe as long as speeds do not create
excessive water spray. Sprays could lead to the risk of inhaling cyanotoxins.
Drinking water
Drinking water directly from areas of the lake affected by a bloom is especially dangerous. Toxins cannot be
removed by boiling, filtering or treating water with camping-style filters. Contact campground management or
the local health department with questions about water available at nearby campgrounds or day use areas.
Not all private treatment systems are effective at removing cyanotoxins. OHA advises people to use an
alternative water source if they do not use a well or public water system, and draw in-home water directly from
an affected area.
Children and pets
Children and pets are at increased risk for exposure because of their size and level of activity. Dogs can get
extremely ill and even die within minutes to hours of exposure to cyanotoxins by drinking the water, licking their
fur, or eating the toxins from floating mats or dried crust along the shore. This is regardless of a recreational
use health advisory in place.
Be aware that dogs can become ill and die from water intoxication after drinking excessive amounts of water
while swimming or fetching objects for long periods of time. Intoxication is a potentially fatal disturbance in
brain function resulting from an imbalance of electrolytes in the body. Water intoxication and heat stroke can
cause similar symptoms as exposure to cyanotoxins.
Symptoms
Exposure to cyanotoxins can be serious and cause a range of symptoms. Symptoms may be similar to food
poisoning such as stomach cramping, diarrhea, nausea and vomiting. Symptoms may also be more serious,
such as numbness, tingling, dizziness and shortness of breath. These symptoms may require medical
attention. Dogs can experience weakness, difficulty walking, seizures, lethargy, loss of appetite and more. Pet
owners should seek veterinary treatment as quickly as possible if their dog exhibits any of those symptoms.
Fishing
Fish caught from areas where cyanobacteria blooms are present may pose unknown health risks, so OHA
recommends not eating fish from those sites. Anyone who decides to eat the fish should remove its fat, skin
and organs before cooking or freezing. Toxins are more likely to collect in these tissues. Fillets should also be
rinsed with clean water.
For health information or to report an illness, contact OHA at 971-673-0482.
