Prospect Lake reopens for recreational use after summer’s blue-green algae

The City of Colorado Springs announced Wednesday that Prospect Lake in Memorial Park has reopened for recreational use.

The lake closed on Aug. 9 due to elevated levels of microcystin toxin, which is produced by cyanobacteria -- more commonly known as blue-green algae. The toxin can be harmful when it comes into contact with people and can be deadly for pets.

Since closing 12 weeks ago, the parks, recreation and cultural services department has been working closely with the Colorado Department of Public Health and Environment to conduct weekly water tests. 

“We are thankful to community members for their patience during the lake closure and particularly pleased that the public adhered to our warnings of avoiding water contact over the last three months,” said Erik Rodriguez, a spokesperson for the City. “Safety is our priority, and we are continuing to actively research ways to address the long-term health of Prospect Lake.”

Tests returned on Oct. 21 and Oct. 29 were well below the acceptable recreational level for the toxin, which is 4 micrograms per liter, according to the release from the City.