Little Sister Lake Dam
Key Takeaway
Little Sister Lake Dam is classified as low hazard in Illinois. It was completed in 1965 and is 61 years old. Its primary use is recreation.
Physical Details
| Dam Height | 38 ft (taller than 80.7% in IL) |
| Dam Length | 380 ft |
| Dam Type | Earth |
| Max Storage | 221 acre-ft |
| Normal Storage | 111 acre-ft |
| Surface Area | 36 acres |
| Year Completed | 1965 (61 years old) |
| NID ID | IL01175 |
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
METROPOLITAN WATER RECLAMATION DISTRICT
Public Utility
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Significant Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Little Sister Lake Dam?
Little Sister Lake Dam 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 Little Sister Lake Dam?
Little Sister Lake Dam is owned by METROPOLITAN WATER RECLAMATION DISTRICT (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Little Sister Lake Dam built?
Little Sister 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 Little Sister Lake Dam?
Little Sister Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Little Sister Lake Dam?
Little Sister Lake Dam has a dam height of 38 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 Little Sister Lake Dam last inspected?
Little Sister Lake Dam was last inspected on June 2, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.