On July 30, 2021, a potential toxic blue-green algae bloom in Willow Creek Reservoir prompted officials to close the reservoir to water contact activities. The reservoir will continued to be monitored on a weekly basis.
According to Colorado Department of Public Health and Environment, toxic algae or harmful algae blooms are made up of what many people call blue-green algae. Technically, these organisms are a special type of bacteria called cyanobacteria. Although these organisms naturally occur in Colorado waters, they become a problem when they multiply rapidly, resulting in a "bloom". The blooms may become harmful when the cyanobacteria produce toxins.
Signs of toxic blue-green algae may resemble thick pea soup, spilled paint on the water's surface, and/or create a thick mat of foam along the shoreline. It is generally green, red, gold, or turquoise. Toxic algae is typically not stringy or mustard yellow in color.
If you see algae blooms:
Stay out of the water.
Don't drink the water.
Keep your pets and livestock away from the water.
Clean fish well with clean water and properly discard guts.
For more information see the detailed video below: