Decorah Upper Milldam
Key Takeaway
Decorah Upper Milldam is classified as low hazard in Iowa. It was completed in 1911 and is 115 years old. Its primary use is recreation.
Physical Details
| Dam Height | 8 ft (taller than 0.7% in IA) |
| Dam Length | 300 ft |
| Dam Type | Gravity |
| Max Storage | 358 acre-ft |
| Normal Storage | 283 acre-ft |
| Surface Area | 70 acres |
| Drainage Area | 568 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1911 (115 years old) |
| Year Modified | 1973 |
| NID ID | IA01289 |
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 Upper Milldam?
Decorah Upper 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 Upper Milldam?
Decorah Upper 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 Upper Milldam built?
Decorah Upper Milldam was completed in 1911, making it 115 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 Upper Milldam?
Decorah Upper 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 Upper Milldam?
Decorah Upper Milldam has a dam height of 8 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 Upper Milldam last inspected?
Decorah Upper Milldam was last inspected on October 1, 2003. Inspection dates indicate when a formal review occurred, not the results of that inspection.