Decorah Lower Milldam
Key Takeaway
Decorah Lower Milldam is classified as low hazard in Iowa. It was completed in 1973 and is 53 years old. Its primary use is recreation.
Physical Details
| Dam Height | 27 ft (taller than 30.7% in IA) |
| Dam Length | 500 ft |
| Dam Type | Gravity |
| Max Storage | 1.3K acre-ft |
| Normal Storage | 1.1K acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 645 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1973 (53 years old) |
| NID ID | IA01288 |
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
Iowa Department of Natural Resources
State Government
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What is the hazard classification of Decorah Lower Milldam?
Decorah Lower 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 Decorah Lower Milldam?
Decorah Lower Milldam is owned by Iowa Department of Natural Resources (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Decorah Lower Milldam built?
Decorah Lower Milldam was completed in 1973, making it 53 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 Decorah Lower Milldam?
Decorah Lower 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 Decorah Lower Milldam?
Decorah Lower Milldam has a dam height of 27 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 Decorah Lower Milldam last inspected?
Decorah Lower Milldam was last inspected on October 1, 2003. Inspection dates indicate when a formal review occurred, not the results of that inspection.