Palmyra-Modesto City Lake Dam
Key Takeaway
Palmyra-Modesto City Lake Dam is classified as significant hazard in Illinois. It was completed in 1965 and is 61 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 50 ft (taller than 91.7% in IL) |
| Dam Length | 620 ft |
| Dam Type | Earth |
| Max Storage | 967 acre-ft |
| Normal Storage | 565 acre-ft |
| Surface Area | 37 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 4,179 cfs |
| Year Completed | 1965 (61 years old) |
| Year Modified | 1984 |
| NID ID | IL00772 |
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
PALMYRA-MODESTO WATER COMMISSION
Public Utility
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Low Hazard 34 ftFrequently Asked Questions
What is the hazard classification of Palmyra-Modesto City Lake Dam?
Palmyra-Modesto City Lake Dam 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 Palmyra-Modesto City Lake Dam?
Palmyra-Modesto City Lake Dam is owned by PALMYRA-MODESTO WATER COMMISSION (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Palmyra-Modesto City Lake Dam built?
Palmyra-Modesto City Lake Dam was completed in 1965, making it 61 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 Palmyra-Modesto City Lake Dam?
Palmyra-Modesto City Lake Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Palmyra-Modesto City Lake Dam?
Palmyra-Modesto City Lake Dam has a dam height of 50 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 Palmyra-Modesto City Lake Dam last inspected?
Palmyra-Modesto City Lake Dam was last inspected on May 5, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.