Henderson
Key Takeaway
Henderson is classified as high hazard in California. It was completed in 1923 and is 103 years old. Its primary use is water supply. 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 Height | 56 ft (taller than 65.1% in CA) |
| Dam Length | 630 ft |
| Dam Type | Earth |
| Max Storage | 500 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1923 (103 years old) |
| NID ID | CA00005 |
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
Amador Regional Sanitation Authority
Public Utility
Nearby Dams
Goffinet
Amador, CA
High Hazard 38 ftPreston Forebay
Amador, CA
Low Hazard 40 ftIone Canal
Amador, CA
Low Hazard 48 ftPreston
Amador, CA
High Hazard 40 ftCsp Mule Creek
Amador, CA
High Hazard 51 ftJackson Creek
Amador, CA
High Hazard 193 ftPlymouth Effluent
Amador, CA
Significant Hazard 59 ftPond K
Amador, CA
Low Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Henderson?
Henderson 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 Henderson?
Henderson is owned by Amador Regional Sanitation Authority (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Henderson built?
Henderson was completed in 1923, making it 103 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 Henderson?
Henderson serves the following purposes: Water Supply, Other, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Henderson?
Henderson has a dam height of 56 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 Henderson last inspected?
Henderson was last inspected on September 15, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.