I want to again share my experience with what was likely a waterborne bacterium I encountered last summer during a river trip in Idaho. We launched during an extended heatwave, which resulted in the river being warm. I developed an infection in my ears that took a couple of weeks to clear.
I’m mentioning this again due to current alerts about blue-green algae throughout the state.
Sadly, several dogs have fallen ill this summer after playing in puddles their owners believed to be safe, only to discover they were contaminated with “blue-green algae.”
Those pets succumbed to toxic effects within hours of exposure.
What we commonly refer to as blue-green algae is not algae at all; it is a form of cyanobacteria made up of billions of photosynthetic organisms. These cyanobacteria can create harmful blooms and take on a blue-green color. They thrive in warm conditions, particularly in stagnant bodies of water.
I was surprised to see photos shared by a colleague showing several isolated green pools in a rock formation. These pools were filled with seawater due to tidal changes. Eventually, the tides will rise again this fall and flush out the pools. However, until that happens, these environments can harbor cyanobacteria, and their color is a warning that the water should be avoided.
Constant companions
Our dogs always accompany us on the river and lake, and we’ve been fortunate that none have shown symptoms of cyanobacteria infection. To prevent this, we ensure they don’t have to cool off or hydrate from potentially contaminated water. We provide them with plenty of fresh water throughout the day and offer shade with a small umbrella in our open boats.
It’s important to know that cyanobacteria can be harmful even without ingestion. Direct skin or eye contact and inhaling aerosols from water spray can spread toxins.
While ingestion is the main concern – especially due to dogs’ tendency to lick – other forms of exposure can lead to irritation or infections.
For more information, check the Oregon Health Department’s advisory website at tinyurl.com/AnglersLogAlgae.
Under advisory
Currently, there are around 20 locations in Oregon, including the main and south forks of the Umpqua River, under advisories due to cyanobacteria, which can pose risks to pets and humans alike. A permanent advisory for the Umpqua remains in effect until summer 2025, while a recent alert at Fern Ridge Reservoir has been lifted.
It’s crucial to remember that cyanobacteria can form in any isolated water during the summer heat, so personal observations are key before entering the water.
Experts anticipate an increase in cyanobacteria incidents due to our warming climate, with traditionally unaffected areas becoming vulnerable.
Any potential exposure should not be disregarded. Seek immediate medical attention for any symptoms after spending time by the water, and ensure pets receive veterinary care as well.
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