(KLZA)-- A health alert has been issued for harmful algae blooms at Kirkman's Cove Lake near Humboldt. 

Samples taken last week were above the state's health alert threshold of 20-parts per billion  of a toxin released by certain strains of blue-green algae.  

The alert will continue at the lake for at least two more weeks, because lakes on a health alert must have two consecutive weeks of readings below the threshold  before the alert is discontinued.  

Kirkman's Cove Lake is closed to all activities involving body contact with the water including swimming and skiing.  

Boating and fishing are permitted, but the public is advised to use caution and avoid exposure to the water. 

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

This is the second algae alert for Kirkman's Cove this summer.