September 13, 2006

Citizens are advised to avoid contact with the water in Willow Creek Reservoir.   For the entire reservoir, one should avoid high concentrations of blue-green algae both on the water surface or shoreline.   Humans and pets are at the highest risk when water is ingested (swallowed either deliberate or incidental) from the areas of high algae concentrations.

Monitoring has confirmed the presence of a species of blue-green algae (Microcystis aeruginosa) having the ability to produce toxins.  The presence of high blue-green algae concentrations have been observed in the reservoir.  Monitoring will continue in the reservoir until toxic algae decline to safe levels. 

The situation is likely to change and water quality advisories will be updated as necessary.  Check for news releases and updates on the Corps of Engineers, Portland District’s Web site at http://www.nwp.usace.army.mil/.

Oregon Department of Human Services recommends the following:

Citizens are hereby advised to avoid all contact with the reservoir.  The area will remain under this health alert for all water contact activities until further notice.  Users should avoid contact with water in any areas where high algae concentrations are observed.  High concentrations of the toxin producing algae appear as a floating green (or blue to blue-green), colored surface scum (resembling thick pea soup) and can wash up on the shoreline, often looking like the shoreline and rocks are painted green.  These areas with high algae concentrations should be avoided.

Symptoms of ingestion of high concentrations of the toxin produced by Microcystis aeruginosa algae could include abdominal pain, vomiting, diarrhea, sore throat, blistering of the mouth and pneumonia, dizziness and fainting.  Pets and other animals are more likely to ingest a fatal dose from the areas of high algae concentrations.  Symptoms reported in cattle include generalized weakness, hyperthermia, anorexia, diarrhea, pale mucous membranes, mental derangement, muscle tremors, coma and death within a few days.

Officials will continue monitoring the water at sites around the reservoir and keep the public advised of health risks.

For further information:  Dave Stone at Department of Human Services (DHS), 971-673-0444