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DHS news release

Sept. 3, 2004

Contact: Bonnie Widerburg (503) 731-4180

Technical contacts: Ken Kauffman, DHS (503) 731-4012; Dan Peddycord, Deschutes Co. Health Dept. (541) 322-7426


Algae advisory lifted for Crane Prairie Reservoir, Deschutes County

A public health advisory for Crane Prairie Reservoir, in effect since July 1, is being removed today by the Oregon Department of Human Services (DHS) and Deschutes County Health Department, in cooperation with the U.S. Forest Service.

Recent samplings of algae from the lake indicate that the Anabaena flos aquae bloom has dissipated. It is hoped that no further blooms will occur in the lake this season, said Ken Kaffmann, DHS environmental health specialist.

Water contact activities, fishing and other recreational activities on and in the lake can safely resume, Kauffman said..

During the bloom, Anabaena flos aquae concentrations reached 60,000 cells per milliliter of lake water. This is four times the DHS advisory threshold of 15,000 cells/ml. Microcystin, one of the toxins produced by this algae, reached a concentration of at least 4.9 ug/l which is almost five times the recommended maximum concentration for drinking water.

Kauffman says that monitoring of the lake will continue and the public will be advised if new algae concerns develop.

Additional information about blue-green algae can be found at the DHS public health advisories Web site, or by calling the contact persons indicated above. Local information may be obtained by calling the local U.S. Forest Service office or the Deschutes County Health Department at (541) 322-7426.