A toxic blue-green algae bloom has been detected in part of Blue Mesa Reservoir at Curecanti National Recreation Area in Colorado, prompting a warning that people and pets should avoid direct contact with the water.
National Park Service staff discovered the presence of the algae during routine water testing that happens throughout the summer. Concentrations of the algae containing a type of poison called cyanotoxins were measured at levels considered unsafe for human exposure.
Toxins were found in the reservoir's Iola Basin at North Willow East on the east side of Sometimes Island, but winds and currents could carry the algae to other parts of the basin. Algae can multiply rapidly and form a scum-like coating on the water, especially in warm shallow water. Warning signs were put up in areas where toxins might be present.
Until further notice, the park recommends that no one swims in or drinks reservoir waters in the Iola Basin. Pets should also be kept away from the water. Use caution and avoid unnecessary exposure to reservoir water if fishing, boating, or otherwise recreating.
People who feel sick after exposure to the water should seek medical care. Symptoms can include nausea, vomiting, digestive distress, breathing problems, seizure, or unexplained illness. Pets exhibiting symptoms should be taken to a veterinarian.
Blue-green algae are common and natural to many waters and are found throughout Colorado.
Boating and fishing remain open throughout Blue Mesa. Harvested fish should be cleaned with potable water and all fishing gear and boats should be cleaned, drained and dried.
Water quality monitoring staff continue to take water samples and monitor conditions. Visitors should check the park website for the latest updates.
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