Upper Monarch Lake
Key Takeaway
Upper Monarch Lake is classified as low hazard in California. It was completed in 1905 and is 121 years old. Its primary use is water supply.
Physical Details
| Dam Height | 22 ft (taller than 18.8% in CA) |
| Dam Length | 263 ft |
| Dam Type | Gravity |
| Max Storage | 314 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1905 (121 years old) |
| NID ID | CA00439 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Southern California Edison
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Upper Monarch Lake?
Upper Monarch Lake is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Upper Monarch Lake?
Upper Monarch Lake is owned by Southern California Edison (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Monarch Lake built?
Upper Monarch Lake was completed in 1905, making it 121 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 Upper Monarch Lake?
Upper Monarch Lake serves the following purposes: Water Supply, Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Upper Monarch Lake?
Upper Monarch Lake has a dam height of 22 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 Upper Monarch Lake last inspected?
Upper Monarch Lake was last inspected on June 23, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.