Gruhlke
Gruhlke is an earth dam located in Jackson County, Minnesota, built in 1974. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Gruhlke
The primary purpose of Gruhlke 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 Tillman, James (private). It impounds the Des Moines River-tr near Jackson.
The dam stands 41 feet tall and stretches 425 feet across, has a maximum storage capacity of 105 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1974, 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 06/28/2022.
At 41 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Minnesota |
| County | Jackson |
| Nearest City | Jackson |
| River/Stream | Des Moines River-tr |
| Coordinates | 43.65107, -95.02249 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 425 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 105 acre-ft |
| Max Storage | 105 acre-ft |
| Normal Storage | 25 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 184 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Tillman, James |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/28/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00842 |
| Federal ID | MN00842 |
| More Info | State Dam Safety Program |