Walnut Grove
Walnut Grove is an earth dam located in Redwood County, Minnesota, built in 1979. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Walnut Grove
The primary purpose of Walnut Grove 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 County Of Redwood (local government). It impounds the Plum Creek-tr near Walnut Grove.
The dam stands 57 feet tall and stretches 1,275 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 1,288 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1979, the structure is 47 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 05/10/2023.
At 57 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Minnesota |
| County | Redwood |
| Nearest City | Walnut Grove |
| River/Stream | Plum Creek-tr |
| Coordinates | 44.21283, -95.49674 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 57 ft |
| Dam Height | 54 ft |
| Dam Length | 1,275 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 1,288 acre-ft |
| Max Storage | 1,288 acre-ft |
| Normal Storage | 231 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 6,057 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | County of Redwood |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/10/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00728 |
| Federal ID | MN00728 |
| More Info | State Dam Safety Program |