The city of Colorado Springs closed Prospect Lake in Memorial Park Aug. 9 after a water sample taken that morning tested positive for a toxin, cyanobacteria, also known as blue-green algae.
The banks of the lake are dotted with closure signs and the swim beach is roped off. Swimming, bathing, paddleboarding, boating of all kinds and other water activities are banned. No pets are allowed in the water.
Fishing areas remain open, but anglers are urged to clean fish well and remove guts.
Media around the county have reported that blue-green algae can be deadly to pets. Dogs in Georgia, North Carolina and Texas died recently after being exposed to the algae in lakes.