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Calder Reservoir Recreational Monitoring

Updates:

December 2, 2024: Harmful algal bloom (HAB) monitoring update

Recreational water quality monitoring has ended for the season. Monitoring will resume in summer 2025. A harmful algal bloom may still be present at this waterbody. Know what to look for and check before recreating.


September 11, 2024: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: A harmful algal bloom is present at Calder Reservoir. Algae in the water may be producing dangerous toxins that can make humans and animals sick. 

TriCounty Health Department has issued a WARNING ADVISORY. 

If you visit Calder Reservoir:


September 4, 2024: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: A harmful algal bloom is present at Calder Reservoir. Algae in the water may be producing dangerous toxins that can make humans and animals sick. 

TriCounty Health Department has issued a WARNING ADVISORY. 

If you visit Calder Reservoir:


August 1, 2024: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: A harmful algal bloom is present at Calder Reservoir. Algae in the water may be producing dangerous toxins that can make humans and animals sick. 

TriCounty Health Department has issued a WARNING ADVISORY. 

If you visit Calder Reservoir:


July 22, 2024: Harmful algal bloom (HAB) monitoring update

BE CAREFUL: Monitoring partners saw visible signs of a harmful algal bloom at Calder Reservoir.  There could be algae in the water producing dangerous toxins.

If you visit, we recommend:

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