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Harmful algae blooms confirmed at Wyoming’s Leazenby Lake

Harmful algae bloom at Leazenby Lake (Wyoming DEQ)

CASPER, Wyo. — Harmful cyanobacterial algae blooms have been confirmed at Wyoming’s Leazenby Lake, also known as Hundred Springs Reservoir. The lake is located south of Laramie.

A bloom advisory has been issued by the Wyoming Department of Health due to the presence of the harmful algae. The advisory was issued on Tuesday.

The dominant cyanobacteria type confirmed at Leazenby Lake was Phormidium, according to the Wyoming Department of Environmental Quality. The density in the lake was found to be 20,078 cyanobacteria cells per milliliter of water.

“Harmful cyanobacterial blooms (HCBs) are dense concentrations of cyanobacteria, commonly referred to as blue-green algae, that pose a health risk to people, pets, and livestock,” the Wyoming Department of Environmental Quality states. “DEQ is working with the Wyoming Department of Health, the Wyoming Livestock Board, and other stakeholders to address HCBs in Wyoming surface waters.”

The Harmful Cyanobacterial Bloom (HCB) Advisories in Wyoming map shows that possible blooms at Buffalo Bill Reservoir are under investigation.

While DEQ investigated the Lake Shore Campground and Bartlett Lane areas of Buffalo Bill Reservoir on June 14 and found that cyanobacteria abundance was below recreational thresholds, DEQ says that a potential bloom was again reported on July 12.

A bloom advisory for Buffalo Bill Reservoir has not yet been issued, though.

Investigations into possible blooms at Alcova Reservoir, Flaming Gorge and Kendall Warm Springs have all been closed with no recreational use advisories issued.