The U.S. Army Corps of Engineers has upgraded the harmful algal bloom status at Blue Marsh Lake from a Watch to an Advisory, warning visitors to use caution around areas of the lake where blue-green algae may be present.
The advisory, issued Wednesday, July 1, follows the detection of moderate levels of cyanobacteria, commonly known as blue-green algae. While toxins associated with harmful algal blooms may be present, officials said weekly testing at the lake’s designated swim beach has not detected toxins, and the beach remains open.
Officials cautioned, however, that conditions can change quickly and encouraged visitors to assess water conditions before swimming, boating or allowing pets into the water.
The advisory recommends avoiding contact with water that appears extremely discolored or contains foam, scum or mats of algae on the surface, as these can be signs of a harmful algal bloom.
Children and pets are considered especially vulnerable to toxins produced by blue-green algae. Officials advise that they should not play in or drink water that appears scummy or discolored.
Anyone who comes into contact with water that may contain harmful cyanobacteria should rinse off with fresh water as soon as possible.
The U.S. Army Corps of Engineers said visitors can continue to check the current harmful algal bloom status through the Blue Marsh Lake website, the lake’s social media pages and the park’s phone system. Additional information about harmful algal blooms and associated health risks is also available through the Corps’ Blue Marsh Lake resources.
For more information, visitors may contact the Blue Marsh Lake Park Office at 610-376-6337.