Mallard #1

SACKETT DRAW· Johnson, Wyoming· Built 1999· Earth· 23 ft tall
Low Hazard Fire Protection Stock Or Small Fish Pond Federal Government

Key Takeaway

Mallard #1 is classified as low hazard in Wyoming. It was completed in 1999 and is 27 years old. Its primary use is fire protection.

Physical Details

Dam Height 23 ft (taller than 32.5% in WY)
Dam Length260 ft
Dam TypeEarth
Max Storage56 acre-ft
Normal Storage17 acre-ft
Surface Area4 acres
Drainage Area1 sq mi
Max Discharge1,162 cfs
Year Completed1999 (27 years old)
NID IDWY02356

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: June 30, 2022
State Regulated: Yes
Regulatory Agency: SEO

Ownership

USDI BLM

Federal Government

Nearby Dams

Horn

Johnson, WY

Low Hazard 45 ft

Pass

Johnson, WY

Low Hazard 36 ft

Pass Creek

Johnson, WY

Low Hazard 27 ft

Smith No. 2

Johnson, WY

Low Hazard 25 ft

Lyle

Johnson, WY

Low Hazard 37 ft

Horn Creek

Johnson, WY

Low Hazard 35 ft

Simmons

Johnson, WY

Low Hazard 24 ft

Dwight

Johnson, WY

Low Hazard 34 ft

Frequently Asked Questions

What is the hazard classification of Mallard #1?

Mallard #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 Mallard #1?

Mallard #1 is owned by USDI BLM (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Mallard #1 built?

Mallard #1 was completed in 1999, making it 27 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 Mallard #1?

Mallard #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 Mallard #1?

Mallard #1 has a dam height of 23 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 Mallard #1 last inspected?

Mallard #1 was last inspected on June 30, 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.