Mary No. 1

NORTH FORK WATKINS CREEK· Carbon, Wyoming· Built 1948· Earth· 38 ft tall
Low Hazard Irrigation Fire Protection Stock Or Small Fish Pond Private

Key Takeaway

Mary No. 1 is classified as low hazard in Wyoming. It was completed in 1948 and is 78 years old. Its primary use is irrigation.

Physical Details

Dam Height 38 ft (taller than 84.6% in WY)
Dam Length450 ft
Dam TypeEarth
Max Storage140 acre-ft
Normal Storage110 acre-ft
Surface Area10 acres
Drainage Area1 sq mi
Max Discharge0 cfs
Year Completed1948 (78 years old)
NID IDWY02040

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: July 7, 2021
State Regulated: Yes
Regulatory Agency: SEO

Ownership

LES & SHELLY DUNMIRE CO TRUSTEES

Private

Nearby Dams

White

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Low Hazard 31 ft

Pine Cone No. 2

Carbon, WY

Low Hazard 39 ft

Pine Creek

Carbon, WY

Low Hazard 30 ft

Pine Cone No. 1

Carbon, WY

Low Hazard 30 ft

Bosler

Carbon, WY

Low Hazard 18 ft

Seepage

Carbon, WY

Low Hazard 16 ft

Pierce

Carbon, WY

Significant Hazard 30 ft

Little Pierce

Albany, WY

Low Hazard 24 ft

Frequently Asked Questions

What is the hazard classification of Mary No. 1?

Mary 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 Mary No. 1?

Mary No. 1 is owned by LES & SHELLY DUNMIRE CO TRUSTEES (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Mary No. 1 built?

Mary No. 1 was completed in 1948, making it 78 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 Mary No. 1?

Mary No. 1 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 Mary No. 1?

Mary No. 1 has a dam height of 38 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 Mary No. 1 last inspected?

Mary No. 1 was last inspected on July 7, 2021. 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.