Johnson
Key Takeaway
Johnson is classified as high hazard in Utah. It was completed in 1910 and is 116 years old. Its primary use is irrigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Length | 448 ft |
| Dam Type | Earth |
| Max Storage | 14.8K acre-ft |
| Normal Storage | 10.4K acre-ft |
| Drainage Area | 36 sq mi |
| Max Discharge | 80 cfs |
| Year Completed | 1910 (116 years old) |
| NID ID | UT00153 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
FREMONT IRRIGATION COMPANY
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Johnson?
Johnson is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Johnson?
Johnson is owned by FREMONT IRRIGATION COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnson built?
Johnson was completed in 1910, making it 116 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 Johnson?
Johnson serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Johnson last inspected?
Johnson was last inspected on September 20, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.