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Advisory warns of blue-green algae bloom at Lost Creek Lake

By Mark Freeman
Mail Tribune

Blue-green algae has reared its potentially toxic head again at Lost Creek Lake, triggering a public-health advisory against water contact by people or pets at Jackson County's largest reservoir.

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Blue-green algae has reared its potentially toxic head again at Lost Creek Lake, triggering a public-health advisory against water contact by people or pets at Jackson County's largest reservoir.

The Oregon Health Authority on Thursday issued the volunteer advisory — currently the only one in Oregon — after the discovery of a large bloom of the cyanobacteria at the reservoir that feeds the Rogue River.

U.S. Army Corps of Engineers field crews Monday abruptly discovered a large mat of bluish-green material near the spillway access area along the dam's southwest side, says Justin Stegall, the Corps' natural-resource specialist at the project.

"It was pretty dense," Stegall says. "I was pretty surprised it came on like it did."

Tests on water sampled Tuesday showed the presence of two forms of cyanobacteria commonly referred to as blue-green algae that bloom regularly at this Rogue River reservoir 30 miles north of Medford, according to the Corps.

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