Flandreau Dam

Big Sioux· Moody, South Dakota· Concrete· 11 ft tall
Low Hazard Recreation Local Government

Key Takeaway

Flandreau Dam is classified as low hazard in South Dakota. Its primary use is recreation.

Physical Details

Dam Height 11 ft (taller than 1.9% in SD)
Dam Length175 ft
Dam TypeConcrete
Max Storage60 acre-ft
Normal Storage60 acre-ft
Max Discharge0 cfs
Year Modified1889
NID IDSD02633

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
State Regulated: Yes
Regulatory Agency: DANR

Ownership

City of Flandreau

Local Government

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Flandreau Dam?

Flandreau Dam 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 Flandreau Dam?

Flandreau Dam is owned by City of Flandreau (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Flandreau Dam?

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

How tall is Flandreau Dam?

Flandreau Dam has a dam height of 11 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.

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.