Unimin

Minnesota River· Le Sueur, Minnesota· Built 1982· Earth· 20 ft tall
Low Hazard Water Supply Private

Key Takeaway

Unimin is classified as low hazard in Minnesota. It was completed in 1982 and is 44 years old. Its primary use is water supply.

Physical Details

Dam Height 20 ft (taller than 60.7% in MN)
Dam Length205 ft
Dam TypeEarth
Max Storage350 acre-ft
Surface Area9 acres
Drainage Area0 sq mi
Year Completed1982 (44 years old)
NID IDMN01476

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: No
Last Inspection: April 22, 2022
State Regulated: Yes
Regulatory Agency: MNDNR EWR

Ownership

Covia

Private

Nearby Dams

State Hospital Pond

Nicollet, MN

Significant Hazard 31 ft

Lake Emily

Le Sueur, MN

Low Hazard 9 ft

Warren St Detention

Blue Earth, MN

Low Hazard 44 ft

Little Lake

Nicollet, MN

Low Hazard 8 ft

North Eagle Lake

Blue Earth, MN

Low Hazard 7 ft

Unimin Wetland Restoration

Le Sueur, MN

Low Hazard 12 ft

Middle Lake

Nicollet, MN

Low Hazard 6 ft

Frequently Asked Questions

What is the hazard classification of Unimin?

Unimin is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Unimin?

Unimin is owned by Covia (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Unimin built?

Unimin was completed in 1982, making it 44 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Unimin?

Unimin serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Unimin?

Unimin has a dam height of 20 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Unimin last inspected?

Unimin was last inspected on April 22, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.