Hanna
Key Takeaway
Hanna is classified as significant hazard in South Dakota. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 12 ft (taller than 3% in SD) |
| Dam Length | 300 ft |
| Dam Type | Earth |
| Max Storage | 27 acre-ft |
| Normal Storage | 21 acre-ft |
| Max Discharge | 150 cfs |
| NID ID | SD02619 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
USDA FS
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Hanna?
Hanna is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Hanna?
Hanna is owned by USDA FS (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
What is the primary purpose of Hanna?
Hanna serves the following purposes: Recreation, Fish And Wildlife Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Hanna?
Hanna has a dam height of 12 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 Hanna last inspected?
Hanna was last inspected on September 24, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.