Twain Harte
Key Takeaway
Twain Harte is classified as significant hazard in California. It was completed in 1928 and is 98 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 36 ft (taller than 40.1% in CA) |
| Dam Length | 325 ft |
| Dam Type | Multi-Arch |
| Max Storage | 143 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1928 (98 years old) |
| NID ID | CA00649 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Twain Harte Lake Association, Inc.
Private
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Low Hazard 60 ftFrequently Asked Questions
What is the hazard classification of Twain Harte?
Twain Harte is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Twain Harte?
Twain Harte is owned by Twain Harte Lake Association, Inc. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Twain Harte built?
Twain Harte was completed in 1928, making it 98 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 Twain Harte?
Twain Harte serves the following purposes: Water Supply, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Twain Harte?
Twain Harte has a dam height of 36 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 Twain Harte last inspected?
Twain Harte was last inspected on September 21, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.