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Idaho’s Brownlee and Hells Canyon Reservoirs Under Health Advisory

Recent samples found high levels of toxin-producing cyanobacteria, and officials said boiling or filtering the water will not remove the toxins.

  • On Monday, the Idaho Department of Health and Welfare issued health advisories for Brownlee Reservoir and Hells Canyon Reservoir after recent water samples revealed high amounts of toxin-producing cyanobacteria.
  • Rising temperatures during Idaho's harmful algal bloom season fuel these outbreaks, which appear as foam, scum, or mats in the Snake River-fed reservoirs.
  • Officials warn that cyanotoxins can cause rashes, respiratory issues, and liver damage in people; pets are especially vulnerable because they lick contaminated water off their fur.
  • A previous advisory from July 7 remains in effect for Crane Creek Reservoir in Washington County, where officials urge visitors to avoid swimming, wading, or drinking the water.
  • Residents should monitor the IDHW website for updates and report sightings to the Idaho Department of Environmental Quality; anyone with symptoms should contact poison control at 1-800-222-1222.
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Cherokee Tribune Ledger NewsCherokee Tribune Ledger News
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Idaho’s Brownlee and Hells Canyon reservoirs under health advisory

Idaho’s Department of Health and Welfare advised recreators to stay out of Brownlee and Hells Canyon reservoirs on Monday, after recent samples revealed high amounts of toxin-producing cyanobacteria. Monday’s advisory comes after the department issued the same warning for Crane…

·Cherokee County, United States
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Idaho PressIdaho Press
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Idaho County Free PressIdaho County Free Press
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Idaho reservoir goers warned of algal blooms

A health advisory has been issued for two reservoirs in southwest Idaho due to algal blooms.

·Cherokee County, United States
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Elkhorn Media Group broke the news on Monday, July 20, 2026.
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