Southwest District Health warns of toxic algae blooms in Brownlee, Hells Canyon Reservoirs

Health officials are urging people not to get in the water at some Idaho reservoirs due to potentially harmful amounts of blue-green algae.

The affected areas are the Hells Canyon Reservoir near the Big Bar Camping area and Brownlee Reservoir near Woodhead Park.

Known as cyanobacteria, high levels can be harmful to people and animals. Those with liver or kidney damage are at an increased risk, Southwest District Health says.

Health officials say people should not swim or wade in the water, and make sure children and pets are not exposed to the water. People also shouldn't drink or cook with it, and boiling and filtering the water can increase the risk. Clean with potable water as soon as possible if the water gets on skin or fur.

The algae can also accumulate in fish, so any fish caught should be cleaned and washed thoroughly. Internal organs should be thrown away, along with the fat, skin and organs before being cooked.

"Cyanobacteria are a natural part of Idaho’s water bodies," the health district said Friday in a release. "When temperatures rise, their populations can bloom and toxic chemical compounds, or cyanotoxins, can be released into the water."

The blooms can look like mats, foam, spilled paint or surface scum, and have a foul odor.

Symptoms of exposure include rashes, hives, diarrhea, vomiting, coughing, and/or wheezing. It can also impact the liver and nervous system if ingested. Southwest District Health says you should contact your healthcare provider if symptoms persist.

Southwest District Health will send an update when the health advisory is lifted.