Lost Creek Reservoir is approximately 10 miles northeast of Croydon in Morgan County. DEQ’s recreational water quality monitoring checks for two health concerns: Harmful Algal Blooms (HABs) and Waterborne Pathogens (E. coli). Find the most recent monitoring information below.
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Updates
November 1, 2025: Recreational water quality monitoring update
Recreational water quality monitoring has ended for the season. Monitoring will resume in June or July 2026. Harmful algal blooms can occur year-round, so know what to look for and always check before recreating.
October 24, 2025: Harmful algal bloom (HAB) monitoring update
GOOD NEWS: Our monitoring team did not see any visible signs of a harmful algal bloom. Learn more about harmful algal blooms.
Sites visited: Southwest shore near spillway, southeast short near dam crossing, and at boat ramp
October 8, 2025: Harmful algal bloom (HAB) monitoring update
BE CAREFUL: A harmful algal bloom is present at Lost Creek Reservoir. Algae in the water may be producing dangerous toxins that can make humans and animals sick.
Weber-Morgan Health Department has issued a WARNING ADVISORY.
If you visit the reservoir:
- Do not swim or water ski
- Avoid areas of algae when boating
- Clean fish well and discard skin and guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
September 17, 2025: Harmful algal bloom (HAB) monitoring updateate
BE CAREFUL: A harmful algal bloom is present at Lost Creek Reservoir. Algae in the water may be producing dangerous toxins that can make humans and animals sick.
Weber-Morgan Health Department has issued a WARNING ADVISORY.
If you visit the reservoir:
- Do not swim or water ski
- Avoid areas of algae when boating
- Clean fish well and discard skin and guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
August 22, 2025: Harmful algal bloom (HAB) monitoring update
BE CAREFUL: A harmful algal bloom is present at Lost Creek Reservoir. Algae in the water may be producing dangerous toxins that can make humans and animals sick.
Weber-Morgan Health Department has issued a WARNING ADVISORY.
If you visit the reservoir:
- Do not swim or water ski
- Avoid areas of algae when boating
- Clean fish well and discard skin and guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
July 14, 2025: Waterborne pathogen (E. coli) and HAB monitoring update
GOOD NEWS: E. coli counts were measured below recreational thresholds and our monitoring team did not see any visible signs of a harmful algal bloom.
Sites sampled: Southwest shore near spillway, southeast short near dam crossing, and at boat ramp
June 23, 2025: Waterborne pathogen (E. coli) and HAB monitoring update
GOOD NEWS: E. coli counts were measured below recreational thresholds and our monitoring team did not see any visible signs of a harmful algal bloom.
Sites sampled: Southwest shore near spillway, southeast short near dam crossing, and at boat ramp