(Des Moines) A Southwest Iowa Lake is one of three Iowa State Lakes that is currently under advisory this weekend.
The DNR says unseasonably warm weather and water temperatures have prompted concerns about microcystin, a product of blue-green algae.
There is currently an advisory for total microcystins for the beach at Green Valley Lake near Creston. Blue-green algae can grow quickly and become very abundant in warm, shallow, undisturbed surface water that receives a lot of sunlight – conditions that have been prevalent throughout the state this summer.
Because the conditions are conducive to blue-green algae growth, people and pets should not be in contact with water that has a poor appearance. The appearance can be a pea-green or blue-green color, but also a reddish-brown. It may appear with scum, foam or as a thick mat on the water surface. Blue-green algae can grow quickly and become very abundant in warm, shallow, undisturbed surface water that receives a lot of sunlight.
The main risk to humans from microcystin is skin irritations and rashes, but if the water is swallowed or airborne droplets are inhaled during swimming, bathing or showering, symptoms could be worse. Those would include headaches, nausea, abdominal pain, seizures, liver injury and respiratory problems.
The other two lakes include; Big Creek Lake, and Rock Creek Lake.
September 1, 2012