Moccasin Lower
Key Takeaway
Moccasin Lower is classified as high hazard in California. It was completed in 1930 and is 96 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 | 60 ft (taller than 67.2% in CA) |
| Dam Length | 720 ft |
| Dam Type | Earth |
| Max Storage | 554 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 26 sq mi |
| Year Completed | 1930 (96 years old) |
| NID ID | CA00122 |
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
San Francisco Public Utilities Commission
Local Government
Nearby Dams
Priest
Tuolumne, CA
High Hazard 168 ftGroveland Wastewater Reclamation #2
Tuolumne, CA
High Hazard 45 ftBig Creek
Tuolumne, CA
High Hazard 120 ftGrinding Rock
Tuolumne, CA
Low Hazard 55 ftGardella
Tuolumne, CA
Low Hazard 69 ftMcmahon
Mariposa, CA
Low Hazard 52 ftGreen Valley
Mariposa, CA
Low Hazard 33 ftDon Pedro Main
Tuolumne, CA
High Hazard 585 ftFrequently Asked Questions
What is the hazard classification of Moccasin Lower?
Moccasin Lower 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 Moccasin Lower?
Moccasin Lower is owned by San Francisco Public Utilities Commission (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Moccasin Lower built?
Moccasin Lower was completed in 1930, making it 96 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 Moccasin Lower?
Moccasin Lower serves the following purposes: Other, Hydroelectric, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Moccasin Lower?
Moccasin Lower has a dam height of 60 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 Moccasin Lower last inspected?
Moccasin Lower was last inspected on January 19, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.