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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:
- Do not swim or water ski
- Avoid areas of algae when boating
- Clean fish well and discard guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
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:
- Do not swim or water ski
- Avoid areas of algae when boating
- Clean fish well and discard guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
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:
- Do not swim or water ski
- Avoid areas of algae when boating
- Clean fish well and discard guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
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:
- Do not swim or water ski in areas of algae
- Avoid areas of algae when boating
- Clean fish well and discard guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom