Summer weather can bring blue-green algae blooms to lakes

The Mt. Hood National Forest encourages people recreating on the national forest to be aware of potential blue-green algae blooms on lakes in the northern Oregon Cascades and reservoirs as the weather warms.

Cyanobacteria, more commonly called blue-green algae, are not algae at all but a primitive single celled bacterium found naturally in fresh and saltwater. Under ideal conditions, cyanobacteria can multiply into a large visible mass called a "bloom." These blooms can be associated with toxins produced by the cyanobacteria and can cause harm to humans and animals. Beginning in May and throughout the summer, blue-green algae blooms can occur.

The following are risks from recreating where there is a blue-green algae bloom:

• Water contact can cause skin irritation or rash
• Swallowing water can result in diarrhea, cramps, vomiting and dizziness
• More severe reactions occur when large amounts of water are swallowed
• Children and pets are at the greatest risk

The Oregon Health Authority recommends the following guidance: “Don't go into water that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish red. A good rule of thumb for you and your pet is: When in Doubt, Stay Out!”

Find more information about blue-green algae from the Oregon Health Authority.

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