PORTLAND, Ore. — Oregon Health Authority updated a recreational use health advisory today, Sept. 29, for Upper Klamath Lake due to the presence of a cyanobacteria bloom and cyanotoxins above recreational guideline values for human exposure. The lake is in Klamath County. The advisory, originally issued Sept. 16, applied to Moore Park and the surrounding area of Upper Klamath Lake. Due to the size of the lake and the unpredictability of cyanobacteria and the toxins produced, OHA updates advisories on the lake when new sampling data is received. Sampling data received Sept. 28 showed toxin levels above recreational guideline values in the Howard’s Bay area and a substantial decrease in levels at Moore Park. In response to this new data, OHA is lifting the advisory for Moore Park and issuing an advisory for Howard’s Bay and the surrounding area. People should avoid swimming and high-speed water activities, such as water skiing or power boating, in areas of the lake where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy red rash. People are encouraged to visit Upper Klamath Lake and enjoy activities such as fishing, camping, hiking, biking, picnicking and bird watching. Boating is safe as long as speeds do not create excessive water spray, which could lead to inhalation risk.
