Hanning Bros Group Pond
Hanning Bros Group Pond is an earth dam located in Fillmore County, Minnesota, built in 1975. It carries a Low hazard potential classification and has a fair condition assessment.
About Hanning Bros Group Pond
The primary purpose of Hanning Bros Group Pond 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 Hanning Bros Group (private). It impounds the Root River S Branch-tr near Preston.
The dam stands 28 feet tall and stretches 284 feet across, has a maximum storage capacity of 92 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/21/2017.
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Location
| State | Minnesota |
| County | Fillmore |
| Nearest City | Preston |
| River/Stream | Root River S Branch-tr |
| Coordinates | 43.62382, -92.16327 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 25 ft |
| Dam Length | 284 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 92 acre-ft |
| Max Storage | 92 acre-ft |
| Normal Storage | 11 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 699 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Hanning Bros Group |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/21/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00860 |
| Federal ID | MN00860 |
| More Info | State Dam Safety Program |