Scofield Reservoir Algal Bloom Monitoring 2018

Warning Advisory

  • Do not swim or water ski
  • Do not ingest the water
  • Keep pets and livestock away
  • Clean fish well and discard guts
  • Avoid areas of scum when boating

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.


Get BloomWatch App

Help us track cyanobacteria blooms with your smartphone. Go to cyanos.org for more info.

Update September 10, 2018

 

Scofield Reservoir, near the dam, September 7, 2018

The Division of Water Quality (DWQ) visited five sites at Scofield Reservoir on September 7, 2018. The southern end of the reservoir did not show signs of a bloom, but a thick green bloom resembling spilled paint was observed near the dam. Conditions at the Mountain View Boat Ramp had improved, but there were still some sparse, evenly distributed cyanobacteria floating through the water column. The Madsen Bay Boat Ramp still displayed signs of a bloom, but the cyanobacteria were fairly dispersed.

 

DWQ collected samples near the dam for further lab analysis.


Update August 27, 2018

The Division of Water Quality (DWQ) collected samples at two locations on Scofield Reservoir on August 20, 2018. According to Utah Department of Agriculture and Food (UDAF) lab results, both locations were well below the recreation health-based threshold for a Warning Advisory for toxins. However, the Madsen Boat Ramp showed cyanobacteria cell-count concentrations that exceeded the threshold for a Warning Advisory. Water conditions appeared to be better than the previous week.

Scofield Reservoir remains under a Warning Advisory.

Sample Location and Sample Type

  • Madsen Boat Ramp (surface sample)
  • Open Water (elbow-depth integrated composite sample)

Cyanobacteria Cell-Count Concentrations

  • Madsen Boat Ramp: 97,357 cells per milliliter (cells/ml)
  • Open Water: 2,703 cells/ml

Toxin Test Results

  • Madsen Boat Ramp: <0.1 micrograms per liter (µg/L) of anatoxin; <0.1 µg/L of microcystins
  • Open Water: <0.1 µg/L of anatoxin; <0.1 µg/L of microcystins

Update August 15, 2018

Lab results from samples collected on August 6, 2018, at the Madsen Boat Ramp and in the open water at the reservoir showed high cyanobacteria cell-count concentrations at the boat ramp (200,794 cells per milliliter (cells/ml), densities that exceed the recreation health-based threshold for a Warning Advisory. All other test results were below the advisory level.

Warning Advisory for Scofield Reservoir

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. Advisory actions:

  • Do not swim or water ski
  • Do not ingest the water
  • Keep pets and livestock away
  • Clean fish well and discard guts
  • Avoid areas of scum when boating

Sample Locations and Sample Types

  • Madsen Boat Ramp (surface sample)
  • Open water (elbow-depth integrated composite sample)

Cyanobacteria Cell Count Concentrations

  • Madsen Boat Ramp: 200,794 cells per milliliter (cells/ml)
  • Open water: 13,129 cells/ml

Toxin Test Results

Test results are from the Utah Public Health Lab (UPHL)

  • Madsen Boat Ramp: <0.10 micrograms per liter (µg/L) of anatoxin-a; 0.16 µg/L of microcystin
  • Open water: <0.10 micrograms per liter (µg/L) of anatoxin-a; 0.14 µg/L of microcystin

Update August 7, 2018

The Division of Water Quality (DWQ) collected two samples at Scofield Reservoir on July 30, 2018. While cyanobacteria cell-count concentrations continue to exceed the recreation health-based threshold for a Warning Advisory, their densities were significantly lower than the July 23, 2018, samples, which contained cell counts in excess of 23 million cells per milliliter (cells/ml) and 12.8 million cells/ml near the dam and Madsen Boat Ramp, respectively.

Toxin levels remain well below the health-based advisory threshold with the exception of one anatoxin-a level in exceedance of the threshold.

Warning Advisory for Scofield Reservoir

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. Advisory actions:

  • Do not swim or water ski
  • Do not ingest the water
  • Keep pets and livestock away
  • Clean fish well and discard guts
  • Avoid areas of scum when boating

Sample Locations and Sample Type

  • Scofield Reservoir Mountain View Boat Launch (surface sample)
  • Scofield Reservoir Open Water (Elbow-depth integrated composite sample)

Cyanobacteria Cell-Count Concentrations

  • Scofield Reservoir Mountain View Boat Launch: 1,365,020 cells per milliliter (cells/ml)
  • Scofield Reservoir Open Water: 61,765 cells/ml

Toxin Test Results

Utah Public Health Lab (UPHL) test results showed one exceedance of anatoxin-a at the Mountain View Boat Launch, but otherwise, the samples were below the recreation health-based threshold for a Warning Advisory.

  • Scofield Reservoir Mountain View Boat Launch: 0.11 micrograms per liter (µg/L) of anatoxin-a; 0.17 µg/L of microcystin
  • Scofield Reservoir Open Water: <0.1 µg/L of anatoxin-a; 0.26 µg/L of microcystin

Update August 1, 2018

Lab results from samples collected at three locations on July 23, 2018, showed very high cyanobacteria cell-count levels at all sampling sites. Cell counts near the dam and at the Madsen Boat Ramp were approximately 23 million cells per milliliter (cells/ml) and 13 million cells/ml, respectively. While these cyanobacteria cell-count densities exceed the recreational health-based thresholds for a Danger Advisory, bloom conditions improved this week, and toxin levels continue to remain low. After careful consideration of the available data, the Southeast Health Department determined that the current Warning Advisory continues to be protective of human and animal health given bloom conditions in the reservoir.

Warning Advisory for Scofield Reservoir

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. Advisory actions:

  • Do not swim or water ski
  • Do not ingest the water
  • Keep pets and livestock away
  • Clean fish well and discard guts
  • Avoid areas of scum when boating

Sample Locations and Sample Type

  • Mountain View Boat Launch (surface sample)
  • Reservoir near Dam (elbow-depth, integrated composite sample)
  • Madsen Boat Ramp (elbow-depth, integrated composite sample)

Cyanobacteria Cell-Count Concentrations

  • Mountain View Boat Launch: 7,432,688 cells per milliliter (cells/ml)
  • Reservoir near the Dam: 23,363,473 cells/ml
  • Madsen Boat Ramp: 12,843,338 cells/ml

Toxins Test Results

  • Mountain View Boat Launch: 0.8 micrograms per liter (µg/L) of anatoxin-a; 0.21 µg/L of microcystin
  • Reservoir near the Dam: 0.7 µg/L of anatoxin-a; 1.3 µg/L of microcystin
  • Madsen Boat Ramp: 0.41 µg/L of anatoxin-a; 0.23 µg/L of microcystin

Update July 20, 2018

The Division of Water Quality (DWQ) received toxin test results on July 19, 2018, from samples collected on July 16, 2018. Cyanobacteria cell-count concentrations were quite high, particularly at the Madsen Boat Ramp, and exceeded recreational health-based thresholds at all sample sites. While cell-count concentrations increased between July 10 and July 16, 2018, toxin levels overall were below the recreational health-based threshold. The exception is the Madsen Boat Ramp, which continues to exceed the threshold for anatoxin-a.

DWQ will return on July 23, 2018, to collect additional samples.

Warning Advisory for Scofield Reservoir

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. Advisory actions:

  • Do not swim or water ski
  • Do not ingest the water
  • Keep pets and livestock away
  • Clean fish well and discard guts
  • Avoid areas of scum when boating

Sample Locations and Sample Type

  • Mountain View Boat Launch (surface sample)
  • Reservoir near the Dam (elbow-depth integrated composite sample)
  • Madsen Boat Ramp (elbow-depth integrated composite sample)

Cyanobacteria Cell-Count Concentrations

Cyanobacteria cell-count densities greatly exceeded recreational health-based thresholds at all sample sites.

  • Mountain View Boat Launch: 1,691,308 cells per milliliter (cells/ml)
  • Reservoir near the Dam: 6,286,796 cells/ml
  • Madsen Boat Ramp: 39,611,935 cells/ml

Lab Toxin Test Results

Samples were submitted to the Utah Public Health Lab (UPHL) and Utah Department of Agriculture and Food (UDAF) labs for enzyme-linked immunosorbent assay (ELISA) testing. Results listed below are from UDAF. Toxin levels exceeded recreational health-based thresholds for anatoxin-a at the Madsen Boat Launch.

  • Mountain View Boat Launch: <0.1 micrograms per liter (µg/L) for anatoxin-a; <0.1 µg/L for microcystin
  • Reservoir near the Dam: <0.1 µg/L for anatoxin-a; 0.3 µg/L for microcystin
  • Madsen Boat Ramp: 0.37 µg/L for anatoxin-a; 0.84 µg/L for microcystin

Update July 16, 2018

DWQ received cell-count concentrations late Friday afternoon for samples collected July 10, 2018, on Scofield Reservoir. All samples were dominated by or exclusively Dolichospermum, a genus of cyanobacteria known to produce toxins.

With the exception of the North Arm sample, cyanobacteria cell-counts at sampling locations exceeded recreational health-based thresholds. Counts were particularly high at the Frandsen Boy Scout Camp at approximately 7 million cells per milliliter (cells/ml). Increasing cell-count densities indicate the bloom is expanding in the reservoir.

  •  Madsen Boat Ramp: 1,460,332 cells/ml
  •  Mountain View Boat Ramp: 1,375,649 cells/ml
  •  North Arm: 16,667 cells/ml
  •  Frandsen Boy Scout Camp: 6,900,782 cells/ml

The Utah Department of Agriculture and Food (UDAF) lab analyzed the July 10, 2018, sample from the Madsen Boat Ramp and found anatoxin-a levels of 0.16 micrograms per liter (µg/L), which exceeds recreational health-based thresholds.

Warning Advisory for Scofield Reservoir

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. Advisory actions:

  •  Do not swim or water ski
  •  Do not ingest the water
  •  Keep pets and livestock away
  •  Clean fish well and discard guts
  •  Avoid areas of scum when boating

Update July 13, 2018

During July 5, 2018, sampling at Scofield Reservoir, a Division of Water Quality (DWQ) monitoring crew observed that the bloom at the Mountain View Boat Ramp was denser and thicker than the previous week. Toxin test-strip results were negative for both microcystins and anatoxin-a.

The boat ramp at the northwest corner of the reservoir (Madsen Bay Boat Ramp) also showed a heavy bloom presence. Toxin test-strip results from the boat ramp were non-detect for microcystin but positive for anatoxin-a at 0.1 micrograms per liter (µg/L), a level later confirmed by the Utah Public Health Lab (UPHL).

Cyanobacteria cell-count concentrations from the the July 5, 2018, samples at both locations exceeded health-based thresholds, with over 3.4 million cells per milliliter (cells/ml) at Madsen Bay Boat ramp and >250,000 cells/ml at Mountain View Boat Ramp.

The monitoring crew investigated the Boy Scout Camp during its July 10, 2018 visit. The phycocyanin sensor reading was extremely high at the camp, but toxin test strips came back negative for both microcystin and anatoxin-a. A follow-up toxin strip test from the Madsen Bay Boat Ramp on July 10, 2018, showed the continued presence of anatoxin-a at <0.4 µg/L.

Toxin test strip results  from July 12, 2018, samples at the Boy Scout Camp and the Madsen Bay Boat Ramp also came back negative, but  microscope examination of water samples at these sites appeared to confirm cyanobacteria. In addition, the DEQ District Engineer and Southeast Health Department officials observed visual evidence of cyanobacteria in a few isolated pockets at the upstream inlet of Madsen Bay.

The Madsen Boat Ramp sample was sent to UPHL and the Utah Department of Agriculture and Food (UDAF) lab for anatoxin-a testing. DWQ will return to Scofield Reservoir on July 16, 2018, to collect additional samples and track bloom activity.

Based on cyanobacteria cell-count concentrations, the detection of anatoxin-a at sampling sites, and visual observations, the Southeast Health Department has issued a Warning Advisory for Scofield Reservoir.

While some areas of Scofield Reservoir are not currently affected by visible blooms, algae may move or disperse depending on temperature, wind, and weather. Recreationists are advised to be mindful of conditions, as they may change over the course of the day.

Warning Advisory for Scofield Reservoir

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. Advisory actions:

  • Do not swim or water ski
  • Do not ingest the water
  • Keep pets and livestock away
  • Clean fish well and discard guts
  • Avoid areas of scum when boating

According to the Southeast Utah Health Department, city drinking water and Price River Water Improvement District (PRWID)-supplied water is treated and is safe to drink. Canal water is currently unaffected by any residual bloom.

Cyanobacteria Cell-Count Concentrations

All cyanobacteria present in the July 5, 2018 samples were identified as Dolichospermum.

  • Mountain View Boat Ramp: 253,474 cells per milliliter (cells/ml)
  • Madsen Bay Boat Ramp: 3,428,860 cells/ml

Update July 10, 2018

(Click for full version) July 5, 2018 Scofield Reservoir Mountain View Boat Launch Area

Division of Water Quality (DWQ) scientists collected samples at four locations on Scofield Reservoir on July 5, 2018. Two locations had no visible blooms and showed very low values on the crew’s phycocyanin sensor, a probe used to detect, quantify, and monitor cyanobacteria levels. Two other sample locations had visible blooms, and phycocyanin sensor readings at these locations indicated cyanobacteria cell concentrations that warranted sampling.

The Mountain View boat launch area had a visible bloom in the shallows near the boat ramp and around the dock. The DWQ monitoring crew took a surface sample for cyanotoxins and cyanobacteria identification and cell-count concentrations.

The crew observed the greatest cyanobacteria concentrations at the boat launch in the northwest corner of the reservoir. DWQ took two samples: surface and integrated (elbow-depth, integrated composite) for cyanotoxins and cyanobacteria identification and cell-count concentrations.

DWQ scientists ran toxin test strips on the samples on July 6, 2018, that yielded conflicting results for microcystin and anatoxin. The samples were delivered to the Utah Public Health Lab and Utah Department of Agriculture and Food (UDAF) lab for further testing. DWQ shipped the phytoplankton samples to Phycotech on July 9, 2018, for cyanobacteria cell-count concentrations and taxa identification. DWQ should have these results back either July 11 or July 12, 2018.

UPHL tests on the samples detected 0.1 micrograms per liter (µg/L) of anatoxin-a at the northwest boat launch, which exceeds the recreational health-based threshold and meets Utah Department of Health/Department of Environmental Quality guidance recommendations for a Warning Advisory. While the lab also detected microcystin at the northwest boat launch, levels were below the recreational health-based threshold. The Mountain View boat launch was non-detect for all toxins.

DWQ monitoring crews will be conducting follow-up sampling at Scofield early this week as bloom photos and HABs-buoy data indicate increasing levels of cyanobacteria in the reservoir.