~ Colorado Springs, CO - The City of Colorado Springs has taken a precautionary measure by closing Prospect Lake in Memorial Park due to the presumed return of blue-green algae. The closure, effective immediately and until further notice, follows a visual inspection by Parks, Recreation and Cultural Services (PRCS) staff and a water sample test conducted by Colorado Springs Utilities on Wednesday, July 24.

The test results confirmed the presence of mycrocystin toxin, which is produced by cyanobacteria, also known as blue-green algae. "It is always a difficult decision to close a popular recreational area especially in the middle of summer, but when it comes to the health and safety of the public, it is important that we take all the necessary precautions," stated Erik Rodriguez, senior environmental, health and safety specialist for PRCS.

According to Rodriguez, algae blooms can produce toxins that can be harmful to humans and pets. Therefore, the decision was made to temporarily close the lake until the levels of algae are safe again. To ensure this, testing will be performed on a weekly basis with at least a required two-week closure before the lake can reopen to the public.

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This is not the first time Prospect Lake has been closed due to blue-green algae. In fact, it was also closed in the summer of 2020 for similar reasons. Since then, PRCS staff has taken proactive measures such as applying an enzyme-based treatment that consumes biomass at the bottom of the lake and helps oxygenate the water. Additionally, PRCS is working with Timberline Building Systems to install an aeration system in Prospect Lake in fall 2024.

During this closure period, certain activities are prohibited including swimming, bathing, paddle boarding, tubing, water skiing and non-motorized boating of any kind. Pets are also not allowed in or near the lake. However, fishing areas will remain open with anglers being urged to clean fish well and remove guts.

Blue-green algae, also known as cyanobacteria, are a type of bacteria commonly found in lakes throughout Colorado. These bacteria multiply quickly under certain conditions such as sustained hot weather, stagnant water, and polluted stormwater runoff. This results in an excess of nitrogen, potassium and phosphorus in the water which causes the harmful bacteria to grow faster than the ecosystem can handle. This not only harms water quality but also decreases the amount of oxygen available to animals living in the water. In some cases, blue-green algae can produce a toxin that is harmful to humans and pets.

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However, it is important to note that blue-green algae are self-limiting and naturally-occurring bacteria. This means that they eventually phase themselves out of bodies of water. The Colorado Department of Public Health and Environment (CDPHE) offers additional information about blue-green algae on its website for those seeking more information.

In conclusion, the closure of Prospect Lake is a necessary step taken by the City of Colorado Springs to ensure the safety and well-being of its residents and visitors. PRCS staff will continue to monitor the lake's water quality and take necessary measures to ensure its safe reopening for recreational activities.

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