Custer 15

Cottonwood River-TR· Lyon, Minnesota· Built 1991· Rockfill· 27 ft tall
Low Hazard Flood Risk Reduction Local Government

Key Takeaway

Custer 15 is classified as low hazard in Minnesota. It was completed in 1991 and is 35 years old. Its primary use is flood risk reduction.

Physical Details

Dam Height 27 ft (taller than 77.1% in MN)
Dam Length280 ft
Dam TypeRockfill
Max Storage110 acre-ft
Drainage Area6 sq mi
Year Completed1991 (35 years old)
NID IDMN01720

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: May 2, 2018
State Regulated: Yes
Regulatory Agency: MNDNR EWR

Ownership

County of Lyon

Local Government

Nearby Dams

Krueger-Gregoire Farm Pond

Lyon, MN

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Custer 10

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Low Hazard 38 ft

Custer 13

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Low Hazard 26 ft

Lyon Cd 14

Lyon, MN

Low Hazard 14 ft

Sodus 26

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Low Hazard 27 ft

Sodus 28

Lyon, MN

Low Hazard 22 ft

Griffith-Glynn Farm Pond

Lyon, MN

Low Hazard 25 ft

Sodus 25

Lyon, MN

Low Hazard 35 ft

Frequently Asked Questions

What is the hazard classification of Custer 15?

Custer 15 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 Custer 15?

Custer 15 is owned by County of Lyon (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Custer 15 built?

Custer 15 was completed in 1991, making it 35 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 Custer 15?

Custer 15 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Custer 15?

Custer 15 has a dam height of 27 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 Custer 15 last inspected?

Custer 15 was last inspected on May 2, 2018. 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.