M. Mraz

TR MOREAU· Ziebach, South Dakota· Built 1956· Earth· 22 ft tall
Low Hazard Fire Protection Stock Or Small Fish Pond Private

Key Takeaway

M. Mraz is classified as low hazard in South Dakota. It was completed in 1956 and is 70 years old. Its primary use is fire protection.

Physical Details

Dam Height 22 ft (taller than 45.6% in SD)
Dam Length690 ft
Dam TypeEarth
Max Storage264 acre-ft
Normal Storage156 acre-ft
Max Discharge3,780 cfs
Year Completed1956 (70 years old)
NID IDSD00580

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

N. MRAZ

Private

Nearby Dams

Mraz Bros

Ziebach, SD

Low Hazard 27 ft

C. Mraz

Ziebach, SD

Low Hazard 13 ft

B. Silverman Dam

Ziebach, SD

Low Hazard 21 ft

Sammons

Ziebach, SD

Low Hazard 21 ft

Sammons No.2

Ziebach, SD

Low Hazard 27 ft

Roy Veit No.4

Ziebach, SD

Low Hazard 25 ft

Bednar Dam

Ziebach, SD

High Hazard 19 ft

Tribe No.4

Ziebach, SD

Low Hazard 28 ft

Frequently Asked Questions

What is the hazard classification of M. Mraz?

M. Mraz 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 M. Mraz?

M. Mraz is owned by N. MRAZ (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was M. Mraz built?

M. Mraz was completed in 1956, making it 70 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 M. Mraz?

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

How tall is M. Mraz?

M. Mraz has a dam height of 22 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.