Willard Bay Reservoir is located at 900 W. 650 N., Willard in Box Elder County. It is west of I-15, exit 357. 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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Updated
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 6, 2025: 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 sampled: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach
September 9, 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: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach
August 6, 2025: HAB monitoring update
GOOD NEWS: Our monitoring team noted signs of a possible harmful algal bloom, but samples confirmed that cyanobacteria concentrations remain below recreational thresholds. Know how to recognize a harmful algal bloom.
Sites sampled: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach
July 29, 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: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach
July 7, 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: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach
June 25, 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: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach
May 20, 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.
Site sampled: Willard Bay State Park N Marina swim beach, Pelican Beach, and Eagle Beach