Mantua Reservoir Recreational Monitoring 2022

Report a Bloom

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

Call Utah Poison Control Center

Call the Poison Control Center

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

Monitoring 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 and recreate safely.

Monitoring will resume in summer 2023.

Monitoring for harmful algal blooms on October 5, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 10/5 observed continued high concentrations of harmful algae and the presence of toxins.

Monitoring for harmful algal blooms on September 28, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 9/28 observed continued high concentrations of harmful algae and the presence of toxins.

Monitoring for harmful algal blooms on September 13, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 9/13 observed continued high concentrations of harmful algae and the presence of toxins.

Monitoring for harmful algal blooms on August 31, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 8/31 observed continued high concentrations of toxin-producing algae. Samples will continue to be collected regularly and results posted here.

Monitoring for harmful algal blooms on August 17, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 8/17 detected high concentrations of toxins and toxin-producing algae in the water. Samples will continue to be collected weekly and results posted here.

Monitoring for harmful algal blooms on August 8, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 8/8 detected high concentrations of toxins and toxin-producing algae in the water. Samples will continue to be collected weekly and results posted here.

Monitoring for harmful algal blooms on August 1, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 8/1 detected high concentrations of toxins and toxin-producing algae in the water. Samples will continue to be collected weekly and results posted here.

Monitoring for harmful algal blooms on July 19, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 7/19 detected high concentrations of toxin-producing algae and toxins in the water.

Monitoring for harmful algal blooms on July 13, 2022

WARNING ADVISORY

Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Under a Warning Advisory:

BE CAREFUL: Sampling at Mantua Reservoir on 7/11 detected high concentrations of toxin-producing algae (8 million cells/mL). Reservoir water may contain dangerous toxins. Additional samples were collected and results will be posted here.

Monitoring for harmful algal blooms on July 11, 2022

HEALTH WATCH

A Health Watch is in effect for Mantua Reservoir.

BE CAREFUL: Our monitoring team saw visible signs of a harmful algal bloom. There could be algae in the water producing dangerous toxins. We collected samples and the results are pending. Check back for updates. In the meantime, we recommend:

Monitoring for harmful algal blooms on June 24, 2022

GOOD NEWS: Our monitoring team did not see any visible signs of a harmful algal bloom.

Sites Observed: At boat ramp and NE boat ramp near Indian Trail Rd and Dike Rd

The Division of Water Quality and the Utah Department of Health will monitor this site for waterborne pathogens and harmful algal blooms this summer, beginning in June 2022. We will share updates here.