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.

This is the third reported sighting in the area, with a sighting reported at Bailey Reservoir in southern Hill County June 28 and at Dry Fork Reservoir in northwestern Blaine County July 16.

The Montana Department of Environmental quality has given Beaver Creek Reservoir a “Caution” status, with no status given for the Bailey Reservoir sighting and the Dry Fork Reservoir sighting listed as pending review.

People are warned to use caution at Beaver Creek Reservoir, and any time they detect a possible harmful algal bloom to avoid exposure to the potential harmful substance; 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 common recommendation is, when it doubt, stay out.

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. 

The blooms have become common in the state and in this region, with all three sites now listed on the DEQ website having had reports in previous years.

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.

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 .

The online interactive Harmful Algal Bloom Map Viewer can be found at https://deq.mt.gov/water/Programs/habs .