Mosier No. 1

LITTLE BOGGY CREEK· Niobrara, Wyoming· Built 1974· Earth· 22 ft tall
Low Hazard Irrigation Private

Key Takeaway

Mosier No. 1 is classified as low hazard in Wyoming. It was completed in 1974 and is 52 years old. Its primary use is irrigation.

Physical Details

Dam Height 22 ft (taller than 28.8% in WY)
Dam Length350 ft
Dam TypeEarth
Max Storage60 acre-ft
Normal Storage35 acre-ft
Surface Area5 acres
Drainage Area8 sq mi
Max Discharge1,686 cfs
Year Completed1974 (52 years old)
NID IDWY01769

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: August 25, 2022
State Regulated: Yes
Regulatory Agency: SEO

Ownership

M & M CATTLE LLC

Private

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Frequently Asked Questions

What is the hazard classification of Mosier No. 1?

Mosier 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 Mosier No. 1?

Mosier No. 1 is owned by M & M CATTLE LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Mosier No. 1 built?

Mosier No. 1 was completed in 1974, making it 52 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 Mosier No. 1?

Mosier 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 Mosier No. 1?

Mosier No. 1 has a dam height of 22 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 Mosier No. 1 last inspected?

Mosier No. 1 was last inspected on August 25, 2022. 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.