Harmful algal blooms at First Lake

Hill County Health Department reports that a harmful algal bloom has been detected at Beaver Creek Reservoir, also called First Lake.

People are warned to use caution at the reservoir, and any time they detect a possible harmful algal bloom to avoid exposure to the potential harmful substance and to keep pets out of the areas where they see algae, and to make sure children don't get into the water.

Harmful algal blooms, commonly called blue-green algae, can potentially be harmful to both people and animals.

The blooms are created by accumulations of cyanobacteria and can create toxins. If the toxins make contact with the skin they could possibly cause skin irritation, rashes, hives or blisters on the skin. If they are ingested it could also cause liver and kidney issues, respiratory symptoms and in some animals can cause seizures. 

Toxins do not always occur with a harmful algal bloom, but it's impossible to tell without taking water quality samples. When in doubt, it's best to stay out, officials warn.

Harmful algal blooms happen when cyanobacteria, also known as blue-green algae, rapidly grow out of control. These organisms are native to Montana and are naturally found at low, safe densities in many freshwater systems

The algae is naturally occurring and also breaks down naturally, if conditions are good. If an area has elevated levels of nutrients, such as runoff from fertilizer or grazing areas, along with warmer temperatures, stagnant still water and sunlight the algae could grow rapidly.

Harmful algal blooms have been reported in the area, including at Beaver Creek Reservoir, multiple times in recent years.

The algae can be identified by its colors, like pea soup or grass clippings, and an oily ring around the algae. The algae also floats on top of the water, with a very distinct look to it.

If anyone spots the blue-green algae they should not touch it or be near it. They should report it immediately to the county or the state. People can report sightings online at https://dphhs.mt.gov/publichealth/Epidemiology/hab .