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Mantua Reservoir Recreational Monitoring

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Updates:

October 31, 2023: Harmful algal bloom (HAB)  monitoring update

Recreational monitoring has ended for the season. Monitoring will resume in summer 2024. Waterborne pathogens may still arise at this waterbody. Know what to look for and check before recreating.

October 19, 2023: Harmful algal bloom (HAB) monitoring update

OK, but be careful: Our monitoring team saw harmful algae throughout the reservoir and accumulating near the north beach. Know how to recognize a harmful algal bloom and avoid areas of algae when recreating.

October 16, 2023: Harmful algal bloom (HAB) monitoring update

GOOD NEWS: A harmful algal bloom has not been present during the past two monitoring visits. The advisory has been removed for Mantua Reservoir. As always, know how to spot a harmful algal bloom, and use care when recreating.

September 29, 2023: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: Harmful algae is present at Mantua Reservoir, but at lower levels than when previously sampled. DWQ and Bear River Health Department will continue to monitor for improvements following an algaecide treatment last week.

In the meantime, Bear River Health Department has issued a WARNING ADVISORY. 

If you visit Mantua Reservoir:

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 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 17, 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 8, 2023: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: A harmful algal bloom was spotted at Mantua Reservoir Algae on 8/7 in the water and may be producing dangerous toxins that can make humans and animals sick. 

Bear River Health Department has issued a WARNING ADVISORY. 

If you visit the Mantua Reservoir:

July 13, 2023: Harmful algal bloom (HAB) monitoring update

GOOD NEWS: Samples taken the last two weeks at Mantua Reservoir have come back below Department of Health advisory thresholds. Low levels of harmful algae are still present, so know how to recognize a harmful algal bloom and avoid areas of visible algae while recreating.

July 11, 2023: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: Low levels of harmful algae are still present in areas of Mantua Reservoir as of July 10th. Recreators to the reservoir should avoid contact with areas where algae is visible.

We recommend:

June 30, 2023: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: Harmful algae and toxins were present in the sample collected at Mantua Reservoir on 6/26. Harmful algae may be present in some areas of the reservoir. We will continue to monitor and post updates here next week.

If you visit the reservoir, we recommend:

June 26, 2023: Harmful algal bloom (HAB) monitoring update

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

In the meantime we recommend:

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