(KLZA)-- A health alert has been issued for Kirkman's Cove Lake in Richardson County due to the presence of toxic blue-green algae.

The Nebraska Department of Energy and Enviroment said in a release that samples taken last week at the lake measured above the threshold of 8 parts per billion of total microcystin, which is a toxin released by certain strains of blue-green algae.

When a health alert is issued, signs are posted to advise the public to use caution, and designated swimming beaches are closed during the alert.

Recreational boating and fishing are permitted, but the public is advised to use caution and avoid exposure to the water, particularly avoiding any activity that could lead to swallowing the water.

Do not let pets get in the water or drink from the lake.

People can still use the public areas for camping, picnics, and other outdoor activities.