Humboldt Milldam
Key Takeaway
Humboldt Milldam is classified as low hazard in Iowa. It was completed in 1912 and is 114 years old. Its primary use is recreation.
Physical Details
| Dam Height | 13 ft (taller than 3.8% in IA) |
| Dam Length | 460 ft |
| Dam Type | Gravity |
| Max Storage | 3.1K acre-ft |
| Normal Storage | 3.1K acre-ft |
| Surface Area | 470 acres |
| Drainage Area | 2,256 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1912 (114 years old) |
| Year Modified | 1970 |
| NID ID | IA01295 |
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
Humboldt County Conservation Board
Local Government
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Significant Hazard 35 ftFrequently Asked Questions
What is the hazard classification of Humboldt Milldam?
Humboldt Milldam 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 Humboldt Milldam?
Humboldt Milldam is owned by Humboldt County Conservation Board (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Humboldt Milldam built?
Humboldt Milldam was completed in 1912, making it 114 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 Humboldt Milldam?
Humboldt Milldam 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 Humboldt Milldam?
Humboldt Milldam has a dam height of 13 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 Humboldt Milldam last inspected?
Humboldt Milldam was last inspected on January 20, 2004. Inspection dates indicate when a formal review occurred, not the results of that inspection.