Harmful algal bloom warning issued for Beaver Creek Reservoir

Montana Department of Environmental Quality today issued an update on caution advisories on harmful algal blooms that included Beaver Creek Reservoir on the north end of Beaver Creek Park about 8 miles south of Havre.

People are warned to use caution at the reservoir to avoid exposure to potential harmful algal blooms and to keep pets out of the areas where they see algae.

DEQ's website says harmful algal blooms -- HABs -- most often occur in Montana’s reservoirs and lakes, although water users should also be cautious about water flowing immediately downstream of a HAB. Common characteristics of HABs include green, blue, or gold coloration and the appearance of grass clippings or paint spilled on the water’s surface.

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. HABs can form under certain conditions including when too many nutrients are available, when winds are low and water is calm, when the sky is clear and sunny, and when the growing season is long or hot.

HABs can produce cyanotoxins that can cause skin irritation or sicken humans and even kill pets and livestock if ingested. Toxins do not always occur with a HAB, but it’s impossible to tell without taking water quality samples. When in doubt, it’s best to stay out.

Watch for more in Tuesday's edition of Havre Daily News.