Harmful Algal Bloom Public Health Watch Upgraded to Warning for Boltz Lake in Grant County

FRANKFORT, Ky. (Sept. 21, 2016) – The Kentucky Division of Water (DOW) and the Kentucky Department for Public Health (KDPH) have issued a harmful algal bloom (HAB) recreational public health warning  for Boltz Lake, located in Grant County, Ky. near Dry Ridge.  The recreational public health warning area includes the entire lake.

Water ingested dboltz-watch-map-2uring recreational activities in this lake may increase the risk of gastrointestinal symptoms such as stomach pain, nausea, vomiting and diarrhea. Skin, eye and throat irritation and/or breathing difficulties may also occur after contact.

On Aug. 31, the Division of Water collected a water sample on Boltz Lake. A HAB recreational public health watch was issued on Sept. 2, because of the risk for elevated levels of microcystin toxins in the lake. On Sep. 19, the Division of Water collected additional water samples on Blotz Lake.  The HAB recreational public health watch has been upgraded to a recreational public health warning advisory because of the risk for elevated cylindrospermopsin.

A Recreational Public Health Warning means algal toxins present are at unsafe levels. Swimming, wading, and water activities that create spray are not recommended.

Blue-green algae occur naturally in the environment and are a vital part of the ecosystem.  Harmful algal blooms arise when there are excess nutrients (phosphorus and nitrogen), sunny conditions, warm temperatures and low-flow or low-water conditions. The more typical green algae, which do not produce toxins, come in many forms and may appear as underwater moss or stringy mats.

Harmful algal blooms, on the other hand, appear as slicks of opaque, bright-green paint, but closer inspection often reveals the grainy, sawdust-like appearance of individual colonies or bacteria. The color of the algae may also appear red or brown.

The following guidelines are recommended to avoid exposure to HABs:

  • Individuals should avoid direct contact with affected water that has unusual color or where blue-green bacteria have been identified, including swimming, wading, paddling, diving and water skiing.
  • People who are prone to respiratory allergies or asthma should avoid areas with HABs. Children may be particularly sensitive.
  • If contact has been made with water containing blue-green algae, wash off with fresh water. In some cases, skin irritation will appear after prolonged exposure. If symptoms persist, consult your health care provider.
  • If fishing in affected waters, fish fillets (not organs) may be consumed after the fillets have been rinsed in clean, non-lake water.
  • Prevent pets and livestock from coming into contact with water where HABs are apparent.

If you are concerned that you have symptoms that are a result of exposure to HABs please see your doctor and call your local health department.

For additional information about this advisory, contact Andrea Keatley at the Kentucky Division of Water at 502-564-3410.


Watermaps.ky.gov – HAB Viewer