Natural Algae Bloom Closes Cherry Creek State Park Swim Area

PHOTO COURTESY OF SAPPHIRE ENERGY Algae contaminated water in vials

Cherry Creek State Park has closed its swim area again in Aurora due to increased levels of blue-green algae growth.

The bloom in natural algae at the park could be harmful to dogs and humans as a result of warmer temperatures, stagnant water and nutrient loading from fertilized lawns. The swim area at the park closed once already this summer on Saturday, July 10 due to an algae bloom.

The swim area shall remain closed until tests show that conditions are acceptable enough to re-open. There has been detections of blue-green algae in other areas of the park where caution signs are placed. Additionally, the Dog-Off-Leash Area stream has been tested and has shown no visible signs of algae.

Recommendations from The Colorado Department of Public Health and Environment (CDPHE) when at the park are as follows:

  • Keep kids out
  • No pets in the water
  • Do not drink water
  • Avoid contact with algae

For more information regarding conditions at Cherry Creek State Park, visit:

Support Northern Colorado Journalism

Show your support for North Forty News by helping us produce more content. It's a kind and simple gesture that will help us continue to bring more content to you.

BONUS - Donors get a link in their receipt to sign up for our once-per-week instant text messaging alert. Get your e-copy of North Forty News the moment it is released!

Click to Donate