Onapa Lake
Key Takeaway
Onapa Lake is classified as low hazard in Oklahoma. It was completed in 1935 and is 91 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 58 ft (taller than 97.1% in OK) |
| Dam Length | 594 ft |
| Dam Type | Earth |
| Max Storage | 2.5K acre-ft |
| Normal Storage | 1.1K acre-ft |
| Surface Area | 49 acres |
| Max Discharge | 4,834 cfs |
| Year Completed | 1935 (91 years old) |
| NID ID | OK02062 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CITY OF CHECOTAH
Local Government
Nearby Dams
Checotah City West
McIntosh, OK
Low Hazard 30 ftChecotah City East
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Low Hazard 18 ftKesselring Richard
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Low Hazard 25 ftBrooks Wiley H
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Onapa Lake?
Onapa Lake is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Onapa Lake?
Onapa Lake is owned by CITY OF CHECOTAH (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Onapa Lake built?
Onapa Lake was completed in 1935, making it 91 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Onapa Lake?
Onapa Lake serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Onapa Lake?
Onapa Lake has a dam height of 58 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Onapa Lake last inspected?
Onapa Lake was last inspected on December 3, 2010. Inspection dates indicate when a formal review occurred, not the results of that inspection.