Anderson No. 1

SOURS DRAW· Niobrara, Wyoming· Built 1959· Earth· 24 ft tall
Low Hazard Fire Protection Stock Or Small Fish Pond Private

Key Takeaway

Anderson No. 1 is classified as low hazard in Wyoming. It was completed in 1959 and is 67 years old. Its primary use is fire protection.

Physical Details

Dam Height 24 ft (taller than 35.6% in WY)
Dam Length270 ft
Dam TypeEarth
Max Storage48 acre-ft
Normal Storage28 acre-ft
Surface Area4 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1959 (67 years old)
NID IDWY01539

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: September 28, 2023
State Regulated: Yes
Regulatory Agency: SEO

Ownership

DIANE SIMON

Private

Nearby Dams

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Three Forks

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House

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Campbell No. 2

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Low Hazard 23 ft

Harris

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Low Hazard 25 ft

Rumney No. 2

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Low Hazard 29 ft

Enl. Brunner

Weston, WY

Low Hazard 37 ft

Geiger

Niobrara, WY

Low Hazard 32 ft

Frequently Asked Questions

What is the hazard classification of Anderson No. 1?

Anderson No. 1 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 Anderson No. 1?

Anderson No. 1 is owned by DIANE SIMON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Anderson No. 1 built?

Anderson No. 1 was completed in 1959, making it 67 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 Anderson No. 1?

Anderson No. 1 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 Anderson No. 1?

Anderson No. 1 has a dam height of 24 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 Anderson No. 1 last inspected?

Anderson No. 1 was last inspected on September 28, 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.