Harmful Cyanobacterial Bloom (HCB) Recreational Use Advisory Lifted at Keyhole Reservoir

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality

Harmful Cyanobacterial Bloom (HCB) Recreational Use Advisory Lifted at Keyhole Reservoir

The Wyoming Department of Health has lifted the harmful cyanobacterial bloom (HCB) recreational use advisory for Keyhole Reservoir in Crook County. Satellite imagery from the Cyanobacteria Assessment Network (CyAN) and other platforms indicated that cyanobacterial blooms have largely dissipated in the reservoir. The Wyoming Department of Health is working directly with water management agencies to remove advisory signs at the reservoir.

There are no active HCB advisories in Wyoming waterbodies at this time.

Although most blooms occur during the warmer summer and fall months, some types of cyanobacteria may reappear or persist in freezing conditions and continue to pose health risks to people and animals. As such, the Department of Health and Wyoming Livestock Board remind the public to avoid contact with and keep pets and livestock away from blue-green water and blooms that may look like floating grass clippings, mats, scums and pastes. Hunters and fishermen should rinse waterfowl and fish with clean water and discard all guts.

For more information on HCBs and recreational use advisories in Wyoming, visit WyoHCBs.org.

Questions about health effects and recreational use advisories can be directed to Dr. Karl Musgrave, State Environmental Health Epidemiologist / State Public Health Veterinarian, Wyoming Department of Health, at karl.musgrave@wyo.gov or (307) 777-5825.

Questions regarding HCB sampling and satellite imagery can be directed to Michael Thomas, Natural Resource Analyst, Wyoming Department of Environmental Quality, at michael.thomas@wyo.gov or (307) 777-2073, or Lindsay Patterson, Surface Water Quality Standards Coordinator, Wyoming Department of Environmental Quality, at lindsay.patterson@wyo.gov or (307) 777-7079.