A sign put up by Franklin County <a href="https://en.wikipedia.org/wiki/Metro_Parks_(Columbus,_Ohio)" class="extiw" title="w:Metro Parks (Columbus, Ohio)">Metro Parks</a>. Located at Beaver Lake in Prarie Oaks Metro Park, the sign warns of a blue-green algea bloom on the lake. Visitors are advised that measures are being taken to mitigate the problem and at the present time visitors should not consume any water from the lake or eat any fish that may be caught from the lake.
<a href="//commons.wikimedia.org/wiki/User:Sixflashphoto" title="User:Sixflashphoto">Sixflashphoto</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>