Many residents heard some bad news via reverse 911 message Friday.

"Due to continuing high levels of algae infestation, the Town Beach at Stevens Pond will remain closed for the remainder of the summer. The Town regrets this unfortunate but necessary decision."

That's right. Stevens Pond won't be opening back up this summer. A high level of cyanobacteria ("blue algae") forced the pond's closure several weeks ago and residents waited patiently for the bacteria levels to decline. And a decline did happen a couple weeks ago. But not for long.

The stubborn cyanobacteria is forcing officials to give up on the pond for this year.

Reimbursement checks for season passes and swimming lessons were mailed last week. For more information, call North Andover Youth and Recreation Services at 978-682-9000.

Cyanobacteria (often called "blue agae" and "pond scum") usually grow in ponds and lakes and can grow very rapidly under certain environmental conditions, such as lots of heat and sunlight and very little rain.

And the stuff isn't just unpleasant to look at. It can also make you sick. Symptoms of cyanobacteria exposure include stomach cramps, diarrhea, vomiting, headache, fever, muscle weakness and difficulty breathing.