Another harmful algal bloom reported on Canyon Ferry


A harmful algal bloom has been found at Canyon Ferry Reservoir near the Hellgate Campground Day Use Area and Boat Launch, county health officials said Monday, making it the second public notification of a bloom on the lake this summer.

Two men fish from the bank of Canyon Ferry Reservoir in late May.

THOM BRIDGE, Independent Record

Testing on July 22 showed a level of microcystin at or above 10 parts per billion (ppb), Lewis and Clark Public Health (LCPH) officials said. The state of Montana and the EPA recreational water recommendations use 4 ppb as the warning level for microcystin toxin.

The county will retest for microcystin soon and will continue testing in Canyon Ferry and other Lewis and Clark County water bodies as needed over the summer, officials said.

On July 12, the Montana Department of Environmental Quality issued a caution advisory for a harmful algal bloom in the Duck Creek area of Canyon Ferry and advised people and pets to stay out of the water. Algal blooms have been identified in other Lewis and Clark County

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