Hannen Lake Dam
Key Takeaway
Hannen Lake Dam is classified as low hazard in Iowa. It was completed in 1959 and is 67 years old. Its primary use is recreation.
Physical Details
| Dam Height | 35 ft (taller than 70.9% in IA) |
| Dam Length | 600 ft |
| Dam Type | Earth |
| Max Storage | 886 acre-ft |
| Normal Storage | 390 acre-ft |
| Surface Area | 39 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1959 (67 years old) |
| NID ID | IA00128 |
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
Benton County Conservation Board
Local Government
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What is the hazard classification of Hannen Lake Dam?
Hannen Lake Dam 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 Hannen Lake Dam?
Hannen Lake Dam is owned by Benton County Conservation Board (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hannen Lake Dam built?
Hannen Lake Dam was completed in 1959, making it 67 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 Hannen Lake Dam?
Hannen Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Hannen Lake Dam?
Hannen Lake Dam has a dam height of 35 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 Hannen Lake Dam last inspected?
Hannen Lake Dam was last inspected on June 28, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.