Hamann Dam

Little Missouri River-TR· Slope, North Dakota· Built 1935· Earth· 44 ft tall

Key Takeaway

Hamann Dam is classified as low hazard in North Dakota. It was completed in 1935 and is 91 years old. Its primary use is fire protection.

Physical Details

Dam Height 44 ft (taller than 93.9% in ND)
Dam Length530 ft
Dam TypeEarth
Max Storage180 acre-ft
Normal Storage180 acre-ft
Surface Area18 acres
Drainage Area2 sq mi
Year Completed1935 (91 years old)
NID IDND00377

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: June 3, 1986
State Regulated: Yes
Regulatory Agency: ND DWR

Ownership

Hamann

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Hamann Dam?

Hamann 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 Hamann Dam?

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

When was Hamann Dam built?

Hamann Dam was completed in 1935, making it 91 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 Hamann Dam?

Hamann Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Hamann Dam?

Hamann Dam has a dam height of 44 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 Hamann Dam last inspected?

Hamann Dam was last inspected on June 3, 1986. 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.