Fillmore County Road 21
Fillmore County Road 21 is an earth dam located in Fillmore County, Minnesota, built in 1979. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Fillmore County Road 21
The primary purpose of Fillmore County Road 21 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 Fillmore (local government). It impounds the Root River-tr near Whalan.
The dam stands 31 feet tall and stretches 500 feet across, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 0 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 04/26/2023.
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Location
| State | Minnesota |
| County | Fillmore |
| Nearest City | Whalan |
| River/Stream | Root River-tr |
| Coordinates | 43.74254, -92.01664 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 500 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Drainage Area | 0 sq mi |
| Max Discharge | 64 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | County of Fillmore |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/26/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00863 |
| Federal ID | MN00863 |
| More Info | State Dam Safety Program |