Health Advisory Issued For South Tenmile Lake

Big Creek Arm of Tenmile Lake, photo Chris Castelli

By Albany Tribune -- (August 25, 2011)

A health advisory prompted by high algae levels found in South Tenmile Lake, located 10 miles north of North Bend, was issued today by Oregon Health Authority’s Public Health Division and Coos County Health Department officials. Water monitoring has confirmed the presence of blue-green algae that can produce toxins harmful to humans and animals.

These algae levels are likely to be associated with dangerous toxin concentrations in the water, according to World Health Organization guidelines. Swallowing or inhaling water droplets should be avoided, as well as skin contact with water by humans or animals. Drinking water from South Tenmile Lake is especially dangerous.

Big Creek Arm of Tenmile Lake, photo Chris Castelli

Oregon Public Health officials advise campers and other South Tenmile Lake visitors that toxins cannot be removed by boiling, filtering or treating the water with camping-style filters. People who draw in-home water directly from South Tenmile Lake are advised to use an alternative water source because private treatment systems are not proven effective in removing algae toxins.

However, public drinking water systems can reduce algae toxins through proper filtration and disinfection. If people on public water systems have questions about treatment and testing, they should contact their water supplier. Oregon health officials recommend that people who choose to eat fish from waters where algae blooms are present should remove all fat, skin and organs before cooking since toxins are more likely to collect in these tissues.

Additionally, public health officials advise that people should not eat freshwater clams from South Tenmile Lake. Crayfish muscle can be eaten, but internal organs and liquid fat should be discarded. Exposure to toxins can produce symptoms of numbness, tingling and dizziness that can lead to difficulty breathing or heart problems and require immediate medical attention.

Symptoms of skin irritation, weakness, diarrhea, nausea, cramps and fainting should also receive medical attention if they persist or worsen. Children and pets are particularly susceptible. The public will be advised when the concern no longer exists.

With proper precautions to avoid water contact, people are encouraged to visit South Tenmile Lake and enjoy activities such as camping, hiking, biking, picnicking, fishing and bird watching. Boating is safe as long as speeds do not create excessive water spray, which could lead to inhalation risk.