Twelve Mile Creek Watershed Site M-1
Key Takeaway
Twelve Mile Creek Watershed Site M-1 is classified as high hazard in Iowa. It was completed in 1983 and is 43 years old. Its primary use is flood risk reduction. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 66 ft (taller than 99.3% in IA) |
| Dam Length | 2,100 ft |
| Dam Type | Earth |
| Max Storage | 27.2K acre-ft |
| Normal Storage | 10.2K acre-ft |
| Surface Area | 633 acres |
| Drainage Area | 23 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1983 (43 years old) |
| NID ID | IA02194 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Creston Waterworks
Local Government
Nearby Dams
Twelve Mile Creek Watershed Site D-62-1
Union, IA
Significant Hazard 35 ftBeattie Dam
Union, IA
Low Hazard 43 ftBeattle Dam
Union, IA
Low Hazard 32 ftBrown Dam
Union, IA
Low Hazard 30 ftTwelvemile Watershed Site D-60
Union, IA
Low Hazard 35 ftTwelve Mile Creek Watershed Site 62-4
Union, IA
Low Hazard 30 ftTwelve Mile Creek Watershed Site 58
Union, IA
Low Hazard 28 ftTwelve Mile Creek Watershed Site 62-5
Union, IA
Low Hazard 36 ftFrequently Asked Questions
What is the hazard classification of Twelve Mile Creek Watershed Site M-1?
Twelve Mile Creek Watershed Site M-1 is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Twelve Mile Creek Watershed Site M-1?
Twelve Mile Creek Watershed Site M-1 is owned by Creston Waterworks (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Twelve Mile Creek Watershed Site M-1 built?
Twelve Mile Creek Watershed Site M-1 was completed in 1983, making it 43 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 Twelve Mile Creek Watershed Site M-1?
Twelve Mile Creek Watershed Site M-1 serves the following purposes: Flood Risk Reduction, Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Twelve Mile Creek Watershed Site M-1?
Twelve Mile Creek Watershed Site M-1 has a dam height of 66 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 Twelve Mile Creek Watershed Site M-1 last inspected?
Twelve Mile Creek Watershed Site M-1 was last inspected on July 24, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.