Extremely high levels of the toxin, microcystin, have been found in the Barnes Unit of the Upper Klamath National Wildlife Refuge.

Waterfowl Hunters and Dog Owners Urged to Exercise Caution

The Oregon Health Authority (OHA) is urging dog owners and waterfowl hunters to exercise caution when visiting the area, which is currently open for the 2025-26 waterfowl hunting season.

The OHA says exposure can cause acute liver damage in humans and can be fatal to dogs. Dogs can die from water intoxication if they drink too much water while swimming or while fetching objects. The OHA has also warned hunters not to use contaminated water for cleaning gear or when handling harvested birds.

Since July 9, people have been warned that recreational activities, such as swimming, boating, and angling,

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