BIG HORN COUNTY, MT — The Montana Department of Environmental Quality is warning residents about harmful algae blooms appearing in lakes and reservoirs across the state.

The Tongue River Reservoir in Big Horn County received its first notice at the end of August.

Mark Landerman, a resident of Cody, Wyoming, often visits the reservoir to fish, but this time he’s taking extra precautions with his dogs due to the presence of blue-green algae.

Watch how this blue-green algae affects pets and humans: Harmful algae blooms spreading across Montana lakes that is toxic to humans and pets

“(It’s) pretty concerning because we do fish quite often in the fall, and it seems like in the past few years it's been happening quite a bit,” Landerman said Sunday.

The algae act like a poison for humans

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