Here’s a Map of All the Harmful Algae Blooms in Northern California

One underreported impact of Northern California’s extreme drought is the heating and low flows of different waterways. With that stagnant water, harmful algae blooms are on the rise, with one person falling ill and a dog dying this week on the North Coast. So how do you know if the waterway you’re going to visit is impacted by harmful algae? One map will show you all the different incident reports in the region.

The California Water Quality Monitoring Council put together a live map that shows where the incident reports are occurring throughout the state. When looking at the map, most of the incidents are occurring on the North Coast (Trinity River, Big Lagoon, Mad River, Klamath River) the Sacramento River Delta, the Russian River and Lake Oroville.

Check out the map:

You can see the entire map here

Cyanobacteria can be present in any fresh water body and looks like green, blue-green, white or brown scum, foam or mats floating on the water. Warm water and abundant nutrients can cause algae to grow more rapidly than usual and these floating algal masses or “blooms” can produce natural toxins that are potent and dangerous. Dogs and children are most likely to be affected because of their smaller body size and tendency to stay in the water for longer periods.

Low flows along several local rivers including the South Fork Eel, Van Duzen and Mad Rivers, coupled with sustained high temperatures in the inland areas and record low rainfall have created the ideal conditions for rapid blooming of this harmful algae.

Since 2001, there have been 12 documented dog deaths locally where the dogs died shortly after swimming in Big Lagoon, the South Fork Eel River or the Van Duzen River. In each instance, water samples confirmed the presence of cyanobacteria in the water.

Most algal blooms in California contain harmless green algae, however, it is difficult to test and monitor the many miles of local rivers with conditions that readily change. To stay safe, it is best to assume that an algal bloom has the potential to contain toxins.

Symptoms in people may include eye irritation, skin rash, mouth ulcers, vomiting, diarrhea and cold or flu-like symptoms. Following exposure to harmful algal blooms, symptoms in dogs may include lethargy, difficulty breathing, salivation, vomiting, urination, diarrhea or convulsions.

The following guidelines are recommended for recreational users of all freshwater bodies in Northern California:

  • Keep children, pets and livestock from swimming in or drinking water containing algal scums or mats.
  • Adults should also avoid wading and swimming in water containing algal blooms. Try not to swallow or inhale water spray in an algal bloom area.
  • If no algal scums or mats are visible, you should still carefully watch young children and warn them not to swallow any water.
  • Fish should be consumed only after removing the guts and liver and rinsing fillets in tap water.
  • Never drink, cook with or wash dishes with water from rivers, streams or lakes.
  • Get medical attention immediately if you think that you, your pet or livestock might have been poisoned by cyanobacteria toxins. Be sure to tell the doctor or veterinarian about possible contact with cyanobacteria or algal blooms.

Active NorCal

Telling the Stories of Northern California

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