Orr

SPRING BRANCH· Crook, Wyoming· Built 1976· Earth· 33 ft tall
Low Hazard Irrigation Fire Protection Stock Or Small Fish Pond Private

Key Takeaway

Orr is classified as low hazard in Wyoming. It was completed in 1976 and is 50 years old. Its primary use is irrigation.

Physical Details

Dam Height 33 ft (taller than 75.3% in WY)
Dam Length1,635 ft
Dam TypeEarth
Max Storage739 acre-ft
Normal Storage351 acre-ft
Surface Area58 acres
Drainage Area6 sq mi
Max Discharge0 cfs
Year Completed1976 (50 years old)
NID IDWY01518

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 31, 2019
State Regulated: Yes
Regulatory Agency: SEO

Ownership

SPRING CREEK LIVESTOCK (ATT. A. MILLS)

Private

Nearby Dams

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Steven

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Low Hazard 20 ft

Hewes No. 1

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Russell Storage

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Paxton

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Low Hazard 27 ft

Red Arrow Storage

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Low Hazard 17 ft

Arrowhead

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Low Hazard 23 ft

Clark

Crook, WY

Low Hazard 28 ft

Frequently Asked Questions

What is the hazard classification of Orr?

Orr 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 Orr?

Orr is owned by SPRING CREEK LIVESTOCK (ATT. A. MILLS) (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Orr built?

Orr was completed in 1976, making it 50 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 Orr?

Orr serves the following purposes: Irrigation, 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 Orr?

Orr has a dam height of 33 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 Orr last inspected?

Orr was last inspected on May 31, 2019. 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.