Access to the boat launch and docks at Henderson Lake are currently closed due to a bloom of Cyanobacteria (blue-green algae).
The Cyanobacteria species may potentially produce toxins that are harmful to people and their pets. Risks are low to humans as the toxins must be ingested. Humans may experience a skin irritation if splashed or swim in the water.
There is a greater risk to pets. Owners are advised to not allow their dogs to swim in the lake or drink the lake water to ensure your pet does not come in contact with the bacteria.
There are no treatments to rid a water body of Cyanobacteria blooms once they are underway. The City's Parks and Cemeteries team currently partake in several recommended prevention methods including aeration mixing and chemical treatment (Phoslock). The prolonged warm weather with little wind for mechanical mixing is likely the cause of this late season bloom.
The species was confirmed today with lab testing and a conversation with Lethbridge College's water department.
Please avoid personal or pet water contact with Henderson Lake until the Cyanobacteria bloom subsides.
For Public Inquiries:
Call 311 | Monday to Friday, 8 a.m. to 4:30 p.m.