Grass Valley
Key Takeaway
Grass Valley is classified as high hazard in California. It was completed in 1964 and is 62 years old. Its primary use is other. 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 | 35 ft (taller than 38.2% in CA) |
| Dam Length | 170 ft |
| Dam Type | Earth |
| Max Storage | 243 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 3 sq mi |
| Year Completed | 1964 (62 years old) |
| NID ID | CA00760 |
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
Arrowhead Lake Association
Private
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High Hazard 28 ftFrequently Asked Questions
What is the hazard classification of Grass Valley?
Grass Valley 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 Grass Valley?
Grass Valley is owned by Arrowhead Lake Association (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grass Valley built?
Grass Valley was completed in 1964, making it 62 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 Grass Valley?
Grass Valley serves the following purposes: Other, Irrigation, Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grass Valley?
Grass Valley has a dam height of 35 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 Grass Valley last inspected?
Grass Valley was last inspected on May 25, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.