Another Treasure Valley Recreation Spot Closed Due To Algae

Jul 23, 2018


Blue-green algae is toxic in large quantities, according to the Idaho Department of Environmental Quality.
Credit Will Reid / Boise State Public Radio

Another summer recreation spot in the Treasure Valley is closed until further notice due to algal bloom.

The Idaho Department of Environmental Quality closed Pond Number 1 at Esther Simplot Park last week. Eagle Island State Park has also been closed due to algae, which produces a toxin.


Brian Reese, a water quality analyst at the DEQ, says this kind of algae occurs naturally in most Idaho bodies of water. In small quantities, it’s harmless. Only when the algae grows out of control, known as a “bloom,” does the toxin pose a threat.

Algal blooms occur most often in the summer, when the water is warmer than usual. Two other factors have made them more common, according to Reese. Algae feed on nitrogen, a chemical commonly used in fertilizers and found in wastewater, so water runoff increase the risk of blooms. Rising global temperatures also contribute, by raising water temperature.

Pond Number 1 will be closed until further notice.

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