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Environment | 8 Colorado lakes suspected of toxic algae…
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8 Colorado lakes suspected of toxic algae blooms. Here’s why it’s getting worse.

Algae can sicken swimmers, kill dogs

The east swim beach at Cherry Creek Reservoir at Cherry Creek State Park remained open on July 31, 2023, though Colorado Parks and Wildlife halted recreation in other sections of the reservoir due to a toxic algae bloom. Water samples collected this week by the Colorado Department of Public Health and Environment showed an elevated presence of microcystin, an algal toxin.(Photo by RJ Sangosti/The Denver Post)
The east swim beach at Cherry Creek Reservoir at Cherry Creek State Park remained open on July 31, 2023, though Colorado Parks and Wildlife halted recreation in other sections of the reservoir due to a toxic algae bloom. Water samples collected this week by the Colorado Department of Public Health and Environment showed an elevated presence of microcystin, an algal toxin.(Photo by RJ Sangosti/The Denver Post)
DENVER, CO - NOVEMBER 8: Elise Schmelzer - Staff portraits at the Denver Post studio. (Photo by Eric Lutzens/The Denver Post)
By | eschmelzer@denverpost.com | The Denver Post
PUBLISHED: | UPDATED:
Getting your player ready...
Colorado's lakes serve as a needed respite during sweltering summer days, but as the days become warmer the state's lakes are becoming more susceptible to toxic blooms of algae.
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