Pony Creek Watershed Site 30
Pony Creek Watershed Site 30 is an earth dam located in Mills County, Iowa, built in 1964. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Pony Creek Watershed Site 30
The primary purpose of Pony Creek Watershed Site 30 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Mills County Swcd (local government). It impounds the Tr-pony Creek near Pacific Junction.
The dam stands 49 feet tall and stretches 639 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 528 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 08/19/2021.
At 49 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Iowa |
| County | Mills |
| Nearest City | Pacific Junction |
| River/Stream | Tr-pony Creek |
| Coordinates | 41.05470, -95.78690 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 49 ft |
| Dam Length | 639 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 528 acre-ft |
| Max Storage | 528 acre-ft |
| Normal Storage | 270 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Mills County SWCD |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/19/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00684 |
| Federal ID | IA00684 |
| More Info | State Dam Safety Program |