HELENA, Mont. — Lewis and Clark Public Health warned residents and visitors that a harmful algal bloom was confirmed at Lake Helena near the Causeway.
The health agency said the bloom raised concerns for people, pets and livestock, especially during hot and calm conditions when blue-green algae can grow quickly and produce toxins.
Because the Causeway is a popular recreation area, Lewis and Clark Public Health urged people to use extra caution there.
"When in doubt, stay out!" Lewis and Clark Public Health said.
The agency told people to avoid swimming, wading, fishing or boating where the water looked green, scummy or like spilled paint.
Officials also warned pet owners to keep dogs out of the water near the Causeway because dogs may swallow water while swimming and lick algae off their fur afterward.
"If you, your children, or your pets accidentally come into contact with a suspected bloom, rinse off thoroughly with clean water as soon as possible," Lewis and Clark Public Health said.