Mcswain
Key Takeaway
Mcswain is classified as high hazard in California. It was completed in 1966 and is 60 years old. Its primary use is hydroelectric. 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 | 97 ft (taller than 81.5% in CA) |
| Dam Length | 1,620 ft |
| Dam Type | Rockfill |
| Max Storage | 9.7K acre-ft |
| Normal Storage | 8.3K acre-ft |
| Surface Area | 310 acres |
| Drainage Area | 1,054 sq mi |
| Max Discharge | 250,000 cfs |
| Year Completed | 1966 (60 years old) |
| NID ID | CA00242 |
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
Merced Irrigation District
Public Utility
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Mcswain?
Mcswain 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 Mcswain?
Mcswain is owned by Merced Irrigation District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mcswain built?
Mcswain was completed in 1966, making it 60 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 Mcswain?
Mcswain serves the following purposes: Hydroelectric, Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mcswain?
Mcswain has a dam height of 97 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 Mcswain last inspected?
Mcswain was last inspected on August 8, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.