Clark No. 1

ALUM CREEK· Niobrara, Wyoming· Built 1959· Earth· 25 ft tall
Low Hazard Irrigation Private

Key Takeaway

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

Physical Details

Dam Height 25 ft (taller than 39.5% in WY)
Dam Length956 ft
Dam TypeEarth
Max Storage496 acre-ft
Normal Storage258 acre-ft
Surface Area39 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1959 (67 years old)
NID IDWY00743

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: November 19, 2019
State Regulated: Yes
Regulatory Agency: SEO

Ownership

CLARK LAND COMPANY, LLC

Private

Nearby Dams

Amelia No. 1

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Leonard Degering

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Story No. 1

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Low Hazard 22 ft

Bad Land No. 2

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Low Hazard 21 ft

Bad Land No. 1

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Low Hazard 18 ft

Clark No. 1

Niobrara, WY

Low Hazard 27 ft

Wallace No. 2

Niobrara, WY

Low Hazard 20 ft

Griswold No. 1

Niobrara, WY

Low Hazard 25 ft

Frequently Asked Questions

What is the hazard classification of Clark No. 1?

Clark 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 Clark No. 1?

Clark No. 1 is owned by CLARK LAND COMPANY, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Clark No. 1 built?

Clark 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 Clark No. 1?

Clark No. 1 serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Clark No. 1?

Clark No. 1 has a dam height of 25 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 Clark No. 1 last inspected?

Clark No. 1 was last inspected on November 19, 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.