Olson-agassiz
Olson-agassiz is an earth dam located in Norman County, Minnesota, built in 1983. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Olson-agassiz
The primary purpose of Olson-agassiz 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 Wd Of Wild Rice (local government). It impounds the Spring Creek-tr near Hadler.
The dam stands 17 feet tall and stretches 4,400 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 2,500 acre-feet, and collects water from a drainage area of 36 square miles. Completed in 1983, the structure is 43 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 08/11/2022.
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Location
| State | Minnesota |
| County | Norman |
| Nearest City | Hadler |
| River/Stream | Spring Creek-tr |
| Coordinates | 47.44149, -96.39632 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 13 ft |
| Dam Length | 4,400 ft |
| Year Completed | 1983 (43 years old) |
Storage & Hydraulics
| NID Storage | 2,500 acre-ft |
| Max Storage | 2,500 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 36 sq mi |
| Max Discharge | 7,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | WD of Wild Rice |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/11/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01009 |
| Federal ID | MN01009 |
| More Info | State Dam Safety Program |