Updates: September 14, 2023: Harmful algal bloom (HAB) monitoring update BE CAREFUL: A harmful algal bloom is present at Mantua Reservoir. Algae in the water is producing dangerous toxins that can make humans and animals sick. Bear River Health Department has issued a WARNING ADVISORY. If you visit Mantua Reservoir: August 31, 2023: Harmful algal …
Read MoreMonitoring for harmful algal blooms on November 2, 2022 Recreation water quality monitoring has ended for the season. Bear River Health Department has lifted the Warning Advisory for Mantua Reservoir. As of last sampling on 10/18 a HAB was still present at the reservoir. Know how to recognize the signs of a harmful algal bloom …
Read MoreUpdate October 27, 2021 (Waterborne Pathogens) On October 25th, the DWQ waterborne pathogens monitoring team visited Mantua Reservoir. Samples from along the north shore contained 261.3 MPN/100mL, which is above the UDWQ/UDOH recommended Warning Advisory threshold of 235 MPN. Follow-up sampling will occur as soon as possible. Update October 25, 2021 (HABs) The Warning Advisory …
Read MoreUpdate November 2, 2020 The Warning Advisory for Mantua Reservoir has been removed as a result of the end of the sampling and monitoring recreation season. The Utah Division of Water Quality’s water recreation season runs from May 1 through October 31. At this time, no further monitoring or sampling for harmful algal blooms or …
Read MoreUpdate November 7, 2019 The Bear River Health Department (BRHD) has removed the Danger and Warning Advisories on Mantua Reservoir. Toxin test results received from the Utah Public Health Lab (UPHL) for samples collected by the Division of Water Quality (DWQ) at the dock near the dam on October 25, 2019, and at the dock …
Read MoreData Update: September 26, 2016 An initial cyanotoxin test screen for a sample taken at the Mantua Reservoir Boat Dock on September 21, 2016, showed microcystin concentrations >10 micrograms per liter (ug/L) and anatoxin levels of 0.4 ug/L. The Division of Water Quality (DWQ) will ship the sample to a certified lab for further testing. …
Read MoreMantua Reservoir in located in a sardine canyon near Mantua, Utah. It sits at an elevation of 5,000 feet and is a popular recreation area for fishing, boating, and water recreation. Data Update November 6, 2017 Brigham City collected a sample from the Mantua Boat Dock on October 31, 2017. Toxigenic cyanobacteria cell-count concentrations continue …
Read MoreFind the latest 2018 harmful algal bloom monitoring updates and health advisories for Mantua Reservoir here.
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