Will-o-b is an earth dam located in Douglas County, Minnesota, built in 1990. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 13 ft13 ft tall and 700 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Will-o-b
The primary purpose of Will-o-b 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 City of Alexandria (local government). It impounds the Long Prairie-os near Alexandria.
The dam stands 13 feet tall and stretches 700 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 340 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1990, the structure is 36 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/05/2017.
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Location
| State | Minnesota |
| County | Douglas |
| Nearest City | Alexandria |
| River/Stream | Long Prairie-os |
| Coordinates | 45.90195, -95.35618 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 9 ft |
| Dam Length | 700 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 12 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 900 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | City of Alexandria |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/05/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00704 |
| Federal ID | MN00704 |
| More Info | State Dam Safety Program |