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Officials close Cow Creek Reservoir near Chinook

Testing indicates high levels of potentially dangerous algae


Last updated 9/23/2019 at 10:07am

Courtesy Montana Department of Environmental Quality

Color from a toxic algal bloom covers rocks and soil near Cow Creek Reservoir in Blaine County.

Press release

Blaine County health officials reported Thursday that a test performed for cyanotoxins associated with a blue-green algae bloom at Cow Creek Reservoir has returned with high results.

As a result, state and local health officials recommend the reservoir, southwest of Chinook, be closed to all recreation and that pets and livestock be kept away from these waters. Closure signs have been posted at access points.

The first report of concerns came Sept. 1 when a woman reported her 10-month-old dog died after drinking water from the outflow of the reservoir.

Blaine County sanit...

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