Harmful algal blooms reported on 2 large West Michigan lakes

GRAND RAPIDS, Mich. (WOOD) — Harmful algal blooms have been reported on two notable lakes in West Michigan: Gun Lake and Muskegon Lake.

The Michigan Department of Environment, Great Lakes and Energy says cyanobacteria was reported on Muskegon Lake July 3, but no tests have confirmed it.

The Barry-Eaton District Health Department says a harmful algal bloom was confirmed Thursday on Gun Lake. The lake remains open, but the BEDHD is encouraging visitors to use caution and avoid water that has “visible algae.”

Visitors are encouraged to avoid any contact with water that appears bright green, blue-green, brown or red or has “floating mats of scum.”

Pets should also avoid the water. If they come into contact with the algae, pets should be rinsed off as soon as possible with clean, fresh water.

Exposure to algae can cause a rash or irritation to the skin, eyes, nose and throat. It can also cause stomach cramps, nausea, vomiting, diarrhea, headache, fever and trouble breathing.

“If you become sick, contact your healthcare provider. Seek medical care right away if you have trouble breathing, severe vomiting, or other serious symptoms,” the BEDHD said in a statement. “If your pet was exposed, rinse them well with clean water and do not let them lick their fur until they have been washed. Contact your veterinarian right away if your pet has vomiting, diarrhea, weakness, trouble walking, excessive drooling, shaking, or seizures.”

Harmful algal blooms are powered by the sudden growth of cyanobacteria, also known as blue-green algae. Cyanobacteria occur naturally in lakes, rivers and ponds but is often boosted by a sudden excess of nutrients, often caused by fertilizer runoff from farms or failed septic systems.

They can last for several days and sometimes even months. The water will look “scummy” or like “spilled paint or pea soup.” They are typically found in the summer and fall — usually peaking in August or September and dying off by the end of October.

You can report a suspected harmful algal bloom to EGLE at AlgaeBloom@Michigan.gov or 1.800.662.9278.