Patch

MUDDY CREEK· Johnson, Wyoming· Built 1958· Earth· 44 ft tall
Low Hazard Irrigation Private

Key Takeaway

Patch is classified as low hazard in Wyoming. It was completed in 1958 and is 68 years old. Its primary use is irrigation.

Physical Details

Dam Height 44 ft (taller than 90.9% in WY)
Dam Length916 ft
Dam TypeEarth
Max Storage473 acre-ft
Normal Storage323 acre-ft
Surface Area26 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1958 (68 years old)
NID IDWY00832

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 6, 2023
State Regulated: Yes
Regulatory Agency: SEO

Ownership

THE JHJ RANCH, LLC

Private

Nearby Dams

Muddy Guard No. 1

Johnson, WY

Low Hazard 50 ft

Muddy Guard No. 2 South Dam

Johnson, WY

High Hazard 57 ft

Muddy Guard No. 2 North Dam

Johnson, WY

Significant Hazard 102 ft

Muffie

Johnson, WY

Low Hazard 40 ft

Tass

Johnson, WY

Low Hazard 35 ft

Basch

Johnson, WY

Low Hazard 34 ft

Steffenson No. 2

Johnson, WY

Low Hazard 41 ft

Steffensen

Johnson, WY

Low Hazard 39 ft

Frequently Asked Questions

What is the hazard classification of Patch?

Patch 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 Patch?

Patch is owned by THE JHJ RANCH, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Patch built?

Patch was completed in 1958, making it 68 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 Patch?

Patch 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 Patch?

Patch has a dam height of 44 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 Patch last inspected?

Patch was last inspected on June 6, 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.