The San Carlos Lake closed on Friday due to a health and safety hazard caused by dead fish. Some activities, like fishing, are prohibited until further notice.
The lake is one of the largest lakes in the state and is located in east-central Arizona.
The San Carlos Recreation and Wildlife Department says drought conditions combined with water releases from the Coolidge Dam caused the sudden death of a large number of fish.
The agency says it will monitor conditions and provide updates when they become available. Those who choose to enter the lake area or attempt to fish face health risks.
The department is asking people to avoid the area.
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