Unimin
Unimin is an earth dam located in Le Sueur County, Minnesota, built in 1982. It carries a Low hazard potential classification and has a fair condition assessment.
About Unimin
The primary purpose of Unimin is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Covia (private). It impounds the Minnesota River near St. Peter.
The dam stands 20 feet tall and stretches 205 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 350 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1982, the structure is 44 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 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 04/22/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Minnesota |
| County | Le Sueur |
| Nearest City | St. Peter |
| River/Stream | Minnesota River |
| Coordinates | 44.27469, -93.99384 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 205 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 350 acre-ft |
| Max Storage | 350 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Covia |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/22/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01476 |
| Federal ID | MN01476 |
| More Info | State Dam Safety Program |