Cooper

BRANCH OF SOUTH POWDER RIVER· Natrona, Wyoming· Built 1933· Earth· 16 ft tall

Key Takeaway

Cooper is classified as low hazard in Wyoming. It was completed in 1933 and is 93 years old. Its primary use is fire protection.

Physical Details

Dam Height 16 ft (taller than 13.2% in WY)
Dam Length1,450 ft
Dam TypeEarth
Max Storage232 acre-ft
Normal Storage95 acre-ft
Surface Area21 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1933 (93 years old)
NID IDWY01009

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 24, 2023
State Regulated: Yes
Regulatory Agency: SEO

Ownership

DONA MARIE VOLD-LARSEN

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Cooper?

Cooper 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 Cooper?

Cooper is owned by DONA MARIE VOLD-LARSEN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Cooper built?

Cooper was completed in 1933, making it 93 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 Cooper?

Cooper 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 Cooper?

Cooper has a dam height of 16 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 Cooper last inspected?

Cooper was last inspected on May 24, 2023. 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.