Jeffers Upper is an earth dam located in Scott County, Minnesota, built in 1981. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 133 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 Jeffers Upper
The primary purpose of Jeffers Upper is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Prior Lake (local government). It impounds the Minnesota River-tr near Prior Lake.
The dam stands 10 feet tall and stretches 133 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 321 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1981, the structure is 45 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 05/17/2023.
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Location
| State | Minnesota |
| County | Scott |
| Nearest City | Prior Lake |
| River/Stream | Minnesota River-tr |
| Coordinates | 44.73310, -93.44624 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 133 ft |
| Year Completed | 1981 (45 years old) |
Storage & Hydraulics
| NID Storage | 321 acre-ft |
| Max Storage | 321 acre-ft |
| Normal Storage | 267 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 18 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Prior Lake |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/17/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01041 |
| Federal ID | MN01041 |
| More Info | State Dam Safety Program |