Lake Elysian is a gravity dam located in Waseca County, Minnesota, built in 1946. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 8 ft8 ft tall and 500 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 Elysian
The primary purpose of Lake Elysian is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mndnr-wildlife (state). It impounds the Mayhew Creek near Janesville.
The dam stands 8 feet tall and stretches 500 feet across, creates a reservoir covering 2,273 acres, has a maximum storage capacity of 19,020 acre-feet, and collects water from a drainage area of 45 square miles. Completed in 1946, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/22/2023.
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Location
| State | Minnesota |
| County | Waseca |
| Nearest City | Janesville |
| River/Stream | Mayhew Creek |
| Coordinates | 44.14667, -93.71102 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 500 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 19,020 acre-ft |
| Max Storage | 19,020 acre-ft |
| Normal Storage | 13,014 acre-ft |
| Surface Area | 2,273 acres |
| Drainage Area | 45 sq mi |
| Max Discharge | 1,735 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mndnr-wildlife |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/22/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00108 |
| Federal ID | MN00108 |
| More Info | State Dam Safety Program |