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The Wyoming Department of Health (WDH) has issued a harmful cyanobacterial bloom (HCB) recreational use Toxin Advisory for Eden Reservoir and Leazenby Lake (Hundred Springs Reservoir) based on data provided by the Wyoming Department of Environmental Quality (DEQ). The WDH is working directly with resource management agencies to ensure that signs are posted at all waterbodies with advisories. Additional details regarding advisory status, including changes to the type of advisory, and other HCB resources can be found at WyoHCBs.org.
The WDH issues recreational use advisories when cyanobacterial cell densities or cyanotoxin concentrations pose a risk to people engaging in swimming or similar water contact activities in areas where cyanobacterial blooms occur. HCBs may also pose a health risk to animals. Bloom Advisories are issued when a HCB is present and toxins may be present. Toxin Advisories are issued when cyanotoxins exceed recreational thresholds. Waterbodies under an advisory are not closed since HCBs may only be present in certain areas and conditions can change frequently. Advisories will remain in place until blooms have fully dissipated and cyanotoxin concentrations are below recreational use thresholds identified in Wyoming's HCB Action Plan.
If you encounter a potential HCB, the Wyoming Department of Health and the Wyoming Livestock Board recommend the following:
- Avoid contact with water in the vicinity of the bloom, especially in areas where cyanobacteria are dense and form scums.
- Do not ingest water from the bloom. Boiling, filtration and/or other treatments will not remove toxins.
- Rinse fish with clean water and eat only the fillet portion.
- Avoid water spray from the bloom.
- Do not allow pets or livestock to drink water near the bloom, eat bloom material, or lick fur after contact.
- If people, pets, or livestock come into contact with a bloom, rinse off with clean water as soon as possible and contact a doctor or veterinarian.
Questions about health effects and recreational use advisories can be directed to Courtney Tillman, Surveillance Epidemiologist, Wyoming Department of Health, at courtney.tillman@wyo.gov or (307) 777-5522. Questions regarding cyanobacteria sampling can be directed to Kelsee Hurshman, Natural Resource Analyst, Wyoming Department of Environmental Quality, at kelsee.hurshman1@wyo.gov or (307) 777-2073.
Current HCB Recreational Use Advisories*
| Waterbody Name |
Observation or Sampling Location(s) |
Advisory Type |
Date Issued |
| Big Sandy Reservoir |
East Dam |
Bloom |
07/14/2022 |
| Boysen Reservoir |
Lake Side Ramp, Brannon Ramp |
Bloom |
07/21/2022 |
| Brooks Lake |
Boat Ramp |
Bloom |
08/04/2022 |
| Diamond Lake |
Northwest Access |
Bloom |
07/28/2022 |
| Eden Reservoir |
South Outlet |
Toxin |
08/09/2022 |
| Flaming Gorge Reservoir |
Firehole Canyon, Buckboard Ramp |
Bloom |
08/04/2022 |
| Gillette Fishing Lake |
South Shore |
Bloom |
06/08/2022 |
| Glendo Reservoir |
Sandy Beach Dune Campground |
Bloom |
07/26/2022 |
| Goshen Hole Reservoir |
Northwest Ramp |
Toxin |
07/28/2022 |
| West Granite Springs Reservoir |
West Causeway |
Bloom |
07/28/2022 |
| Keyhole Reservoir |
Rocky Point |
Bloom |
07/28/2022 |
| Leazenby Lake |
South Access |
Toxin |
08/09/2022 |
| Miller Lake |
Northwest Shore |
Bloom |
08/01/2022 |
| Rainbow Lake |
Southeast Shore |
Bloom |
08/04/2022 |
| Saratoga Lake |
East Beach |
Bloom |
07/28/2022 |
| Sloan Lake |
South Beach |
Bloom |
08/04/2022 |
| Toltec Reservoir |
West Ramp |
Bloom |
07/20/2022 |
| Upper Brooks Lake |
East Shore |
Bloom |
08/04/2022 |
| Upper Jade Lake |
South Shore |
Bloom |
08/04/2022 |
| Wheatland Reservoir Number 3 |
Northwest Ramp |
Bloom |
07/28/2022 |
| Woodruff Narrows Reservoir |
North Ramp |
Bloom |
07/20/2022 |
*There may be additional waterbodies with cyanobacterial blooms in Wyoming that WDH is not aware of. Please report such blooms to WDEQ.
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