Green Valley Lake Dam
Key Takeaway
Green Valley Lake Dam is classified as significant hazard in Iowa. It was completed in 1953 and is 73 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 41 ft (taller than 86.2% in IA) |
| Dam Length | 1,020 ft |
| Dam Type | Earth |
| Max Storage | 6.8K acre-ft |
| Normal Storage | 4.0K acre-ft |
| Surface Area | 336 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1953 (73 years old) |
| Year Modified | 2009 |
| NID ID | IA01097 |
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
Iowa Department of Natural Resources
State Government
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Low Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Green Valley Lake Dam?
Green Valley Lake Dam 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 Green Valley Lake Dam?
Green Valley Lake Dam 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 Green Valley Lake Dam built?
Green Valley Lake Dam was completed in 1953, making it 73 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 Green Valley Lake Dam?
Green Valley Lake Dam serves the following purposes: Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Green Valley Lake Dam?
Green Valley Lake Dam has a dam height of 41 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 Green Valley Lake Dam last inspected?
Green Valley Lake Dam was last inspected on May 27, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.