Aowa Creek 31-20a
Aowa Creek 31-20a is an earth dam located in Dixon County, Nebraska, built in 2003. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Aowa Creek 31-20a
The primary purpose of Aowa Creek 31-20a 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 Lewis & Clark Natural Resources District (local government). It impounds the Powder Creek near Ponca.
The dam stands 62 feet tall and stretches 1,495 feet across, creates a reservoir covering 108 acres, has a maximum storage capacity of 4,421 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 2003, the structure is relatively new.
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 04/11/2022.
At 62 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Nebraska |
| County | Dixon |
| Nearest City | Ponca |
| River/Stream | Powder Creek |
| Coordinates | 42.58881, -96.82947 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 62 ft |
| Dam Height | 51 ft |
| Dam Length | 1,495 ft |
| Year Completed | 2003 (23 years old) |
Storage & Hydraulics
| NID Storage | 4,421 acre-ft |
| Max Storage | 4,421 acre-ft |
| Normal Storage | 942 acre-ft |
| Surface Area | 108 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 10,667 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Lewis & Clark Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/11/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02668 |
| Federal ID | NE02668 |
| More Info | State Dam Safety Program |