Olga Dam

Tongue River· Cavalier, North Dakota· Built 1955· Earth· 65 ft tall
Low Hazard Flood Risk Reduction Local Government

Key Takeaway

Olga Dam is classified as low hazard in North Dakota. It was completed in 1955 and is 71 years old. Its primary use is flood risk reduction.

Physical Details

Dam Height 65 ft (taller than 97.5% in ND)
Dam Length360 ft
Dam TypeEarth
Max Storage961 acre-ft
Normal Storage30 acre-ft
Surface Area4 acres
Drainage Area3 sq mi
Year Completed1955 (71 years old)
NID IDND00044

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 12, 2013
State Regulated: Yes
Regulatory Agency: ND DWR

Ownership

Pembina & Cavalier Co WRB

Local Government

Nearby Dams

Bourbanis Dam

Cavalier, ND

Significant Hazard 73 ft

Senator Young Dam

Cavalier, ND

High Hazard 85 ft

Hanks Corner Dam

Cavalier, ND

Significant Hazard 58 ft

Olson Dam

Pembina, ND

High Hazard 67 ft

Herzog Dam

Pembina, ND

Significant Hazard 38 ft

Weiler Dam

Pembina, ND

Significant Hazard 39 ft

Goschke Dam

Pembina, ND

Significant Hazard 33 ft

Hornung Dam; Greg 1

Cavalier, ND

Low Hazard 14 ft

Frequently Asked Questions

What is the hazard classification of Olga Dam?

Olga 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 Olga Dam?

Olga Dam is owned by Pembina & Cavalier Co WRB (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Olga Dam built?

Olga Dam was completed in 1955, making it 71 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 Olga Dam?

Olga Dam 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 Olga Dam?

Olga Dam has a dam height of 65 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 Olga Dam last inspected?

Olga Dam was last inspected on June 12, 2013. 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.