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Deer Creek Reservoir Algal Bloom Monitoring 2020

Warning Advisory

  • Do not swim or water ski in this area.
  • Avoid areas of algae scum when boating.
  • Keep animals away.
  • Do not ingest the water.
  • Clean fish well and discard guts.

Due to state budget cuts, the harmful algal bloom program is being funded by EPA through a one-time grant. This limits DWQ’s monitoring to 18 priority waterbodies in Utah.

Report a Bloom

24-Hour DEQ Environment Incidents Line: (801) 536-4123

Call Utah Poison Control Center

If you believe you or your pet have been exposed to a harmful algal bloom, call (800) 222-1222.

Update September 21, 2020

Wasatch County Health Department has issued a Warning Advisory for Deer Creek Reservoir at all public access points.

On September 16, 2020, the DWQ HABs monitoring team visited Deer Creek Reservoir. The monitoring team observed a harmful algal bloom at Rainbow Bay and Island Park Marina. Cyanotoxin and toxigenic cell density samples were collected.

Results delivered from UDAF Lab on September 19, 2020 show the liver toxin, microcystin, concentrations greater than 50 ug/L which is at least 6 times greater than the DWQ/DOH Recreational Health Threshold for an advisory.

Rainbow Bay Closeup

Rainbow Bay Closeup

Deer Creek Rainbow Bay

Rainbow Bay


Update September 2, 2020

Wasatch County Health Department has issued a Health Watch for Deer Creek Reservoir.

On September 2, 2020, the DWQ HABs monitoring team visited Deer Creek Reservoir. The monitoring team observed a harmful algal bloom at Rainbow Bay, Charleston Day Use Area, Island Park Marina, and the shoreline at the State Park. Cyanotoxin and cell density samples were collected and results are pending.


Update July 15, 2020

DWQ HAB monitoring of Deer Creek Reservoir was conducted on July 15, 2020. A low-density HAB was observed at Rainbow Bay, Charleston Day Use Area, Island Park Marina, and the shoreline at the State Park. The dominant HAB material consisted of isolated clumps within the water column. Samples were collected at this location but results from the EPA Lab show cyanotoxins as non-detect.