Rockport Reservoir Algal Bloom Monitoring 2019

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

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

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Update November 8, 2019

Rockport Reservoir, October 22, 2019

The Summit County Health Department (SCHD) has removed the Warning Advisory on Rockport Reservoir. Toxin test results received from the Utah Public Health Lab (UPHL) for samples collected by the Division of Water Quality (DWQ) at the Marina on October 22, 2019, and October 29,2019, showed anatoxin-a and microcystin levels well below the recreation health-based threshold for a Warning Advisory.

The close of the monitoring season and removal of advisories doesn’t mean HABs are no longer present, but rather that monitoring data won’t be collected during the colder months to verify their presence. HABs can persist throughout the fall and winter and can pose a potential threat to humans and pets. It’s important for recreators to recognize the signs of a bloom and take appropriate precautions.

Recreators are advised to stay out of the water and avoid any contact with water or scum if they suspect a harmful algal bloom. Hunters and fishers should clean waterfowl and fish well and discard all guts.

Data Summary

Marina

  • Sample date: October 29, 2019
  • Sample type: Elbow-depth integrated composite sample
  • Microcystin: <2.0 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L

Marina

  • Sample date: October 22, 2019
  • Sample type: Elbow-depth integrated composite sample
  • Microcystin: <0.10 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L

Update October 31, 2019

Toxin test results received from the Utah Public Health Lab (UPHL) for samples collected on October 22, 2019, at the Marina at Rockport Reservoir showed anatoxin-a and microcystin levels well below the recreation health-based threshold for a Warning Advisory. Cyanobacteria cell-count concentration results are pending from PhycoTech.

A Warning Advisory indicates a moderate relative probability of acute health risk, cell-count density of 20,000 – 10 million cells per milliliter (cells/ml), microcystin levels of 4-2,000 micrograms per liter (µg/L), or anatoxin-a levels above non-detect.

Rockport Reservoir remains under a Warning Advisory.

Data Summary

Marina

  • Sample date: October 22, 2019
  • Sample type: Elbow-depth integrated composite sample
  • Microcystin: <0.10 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L

Update October 18, 2019

Rockport Reservoir, October 16, 2019

Cyanobacteria cell-count concentrations for surface samples collected by the Division of Water Quality (DWQ) on October 16, 2019, at the Highland Picnic Area at Rockport Reservoir continued to exceed the recreation health-based threshold for a Warning Advisory. The primary taxons in the samples were Aphanizomenon and Dolichospermum.

A Warning Advisory indicates a moderate relative probability of acute health risk, cell-count density of 20,000 – 10 million cells per milliliter (cells/ml), microcystin levels of 4-2,000 micrograms per liter (µg/L), or anatoxin-a levels above non-detect.

The current Warning Advisory for Rockport Reservoir remains in place.

Data Summary

Highland Picnic Area

  • Sample date: October 16, 2019
  • Sample type: Surface sample
  • Cyanobacteria cell counts: 4,478,519 cells per milliliter (cells/mL)

Highland Picnic Area

  • Sample date: October 16, 2019
  • Sample type: Elbow-depth integrated composite sample
  • Cyanobacteria cell counts: 12,811 cells per milliliter (cells/mL)

Rockport Reservoir, October 2, 2019

Rockport Reservoir, October 2, 2019

Update October 11, 2019

Cyanobacteria cell-count concentrations for samples collected by the Division of Water Quality (DWQ) in the open water at Rockport Reservoir on October 7, 2019, exceeded the recreation health-based threshold for a Warning Advisory. Toxin test results for microcystin and anatoxin-a were well below the advisory threshold.

The DWQ monitoring crew observed large amounts of cyanobacteria that resembled green grass clippings as well as spherical nodules of cyanobacteria particles in the water. Some of the cyanobacteria resembling grass clippings were clumped together.

A Warning Advisory indicates a moderate relative probability of acute health risk, cell-count density of 20,000 – 10 million cells per milliliter (cells/ml), microcystin levels of 4-2,000 micrograms per liter (µg/L), or anatoxin-a levels above non-detect.

The current Warning Advisory for Rockport Reservoir remains in place.

Data Summary

Open Water

  • Sample date: October 7, 2019
  • Sample type: Elbow-depth integrated composite sample
  • Microcystin: 0.11 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L
  • Cyanobacteria cell counts: 37,495 cells per milliliter (cells/mL)

Update September 13, 2019

Rockport Reservoir, September 13, 2019

Rockport Reservoir, September 13, 2019

The Summit County Health Department (SCHD) posted Warning Advisory signs at the Highland Picnic Area on Rockport Reservoir on September 13, 2019, to alert the public that the area is experiencing a harmful algal bloom.

Rockport Reservoir remains open for recreation at this time. Recreationists are advised to not swim or waterski in areas of scum, avoid boating in areas of scum, keep animals away, and not ingest water. Visitors can still recreate in the reservoir but are cautioned to be mindful of water conditions, as blooms may move or disperse depending on temperature, wind, and weather.

Cyanobacteria cell-count concentrations for samples collected at the Highland Picnic Area at Rockport Reservoir by the Division of Water Quality (DWQ) on September 10, 2019, exceeded the recreation health-based threshold for a Warning Advisory. Toxin test results were non-detect for microcystin and anatoxin-a.

A Warning Advisory indicates a moderate relative probability of acute health risk, cell-count density of 20,000 – 10 million cells per milliliter (cells/ml), microcystin levels of 4-2,000 micrograms per liter (µg/L), or anatoxin-a levels above non-detect.

Data Summary

Surface sample

  • Sample date: September 10, 2019
  • Microcystin: <2.0 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L
  • Cyanobacteria cell counts: 219,975 cells per milliliter (cells/mL)

Elbow-depth integrated composite sample

  • Sample date: September 10, 2019
  • Microcystin: < 2.0 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L
  • Cyanobacteria cell counts: 1,918 cells per milliliter (cells/mL)