Lake Jefferson is a gravity dam located in Le Sueur County, Minnesota, built in 1938. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 9 ft9 ft tall and 15 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Lake Jefferson
The primary purpose of Lake Jefferson is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mndnr-trails (state). It impounds the Big Cannon River - Tr near Waterville.
The dam stands 9 feet tall and stretches 15 feet across, creates a reservoir covering 700 acres, has a maximum storage capacity of 25,489 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
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 05/27/2008. That was over 18 years ago.
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Location
| State | Minnesota |
| County | Le Sueur |
| Nearest City | Waterville |
| River/Stream | Big Cannon River - Tr |
| Coordinates | 44.27787, -93.74338 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 9 ft |
| Dam Height | 7 ft |
| Dam Length | 15 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 25,489 acre-ft |
| Max Storage | 25,489 acre-ft |
| Normal Storage | 18,544 acre-ft |
| Surface Area | 700 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 265 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mndnr-trails |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/27/2008 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00155 |
| Federal ID | MN00155 |
| More Info | State Dam Safety Program |