~ Colorado Springs, CO - After a mandatory closure and two consecutive negative tests, Prospect Lake in Memorial Park has officially reopened to the public. The popular lake near downtown Colorado Springs was closed on July 24 due to a positive test confirming the presence of mycrocystin toxin, which is produced by cyanobacteria, also known as blue-green algae.

According to Erik Rodriguez, senior environmental, health and safety specialist for Parks, Recreation and Cultural Services (PRCS), the closure was necessary to ensure the health and safety of the community. "We would like to thank the public for their understanding and patience as we worked to address the algae blooms in Prospect Lake," said Rodriguez. "With the extra chemical-free treatments, we are pleased to announce that the lake is now open again for everyone to enjoy."

Visitors can now partake in a variety of activities at Prospect Lake including swimming, bathing, paddle boarding, tubing, water skiing, and non-motorized and motorized boating. However, with warmer temperatures still present throughout the summer months, there is still a possibility of algae blooms. As a precautionary measure, visitors are encouraged not to drink the water or allow children or pets into it. Additionally, any contact with visible algae should be avoided.

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Fishing is permitted at Prospect Lake but anglers are advised to rinse their catch with clean water and properly dispose of any organs when processing. Boaters must also steer clear of any visible algae contact.

PRCS staff will continue to monitor and perform weekly testing at Prospect Lake in order to ensure safe recreational water quality levels set by both the Colorado Department of Public Health and Environment (CDPHE) and the Environmental Protection Agency (EPA).

Blue-green algae 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, causing the bacteria to grow faster than the ecosystem can handle. This can harm water quality, decrease oxygen levels for aquatic animals, and produce a toxin that is harmful to humans and pets.

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However, blue-green algae are self-limiting and eventually phase themselves out of bodies of water. They can be identified by their distinct appearance, which can range from green, turquoise, gold or red water to thick pea soup or spilled paint on the surface. Small specks or blobs may also be present floating at or just below the water's surface. The CDPHE offers additional information about blue-green algae on their website.

As summer continues and temperatures remain high, it is important for visitors to be vigilant for signs of blue-green algae in all warm lakes before entering the water. By following these precautions and staying informed about potential algae blooms, visitors can safely enjoy Prospect Lake once again.

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