Rock Island Lake Dam
Key Takeaway
Rock Island Lake Dam is classified as high hazard in Missouri. It was completed in 1905 and is 121 years old. Its primary use is recreation. 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 | 25 ft (taller than 23.5% in MO) |
| Dam Type | Earth |
| Max Storage | 428 acre-ft |
| Normal Storage | 160 acre-ft |
| Surface Area | 32 acres |
| Drainage Area | 336 sq mi |
| Year Completed | 1905 (121 years old) |
| NID ID | MO20182 |
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
CHICAGO,ROCK ISLAND RR
Private
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What is the hazard classification of Rock Island Lake Dam?
Rock Island Lake Dam 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 Rock Island Lake Dam?
Rock Island Lake Dam is owned by CHICAGO,ROCK ISLAND RR (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Rock Island Lake Dam built?
Rock Island Lake Dam 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 Rock Island Lake Dam?
Rock Island Lake Dam serves the following purposes: Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Rock Island Lake Dam?
Rock Island Lake Dam has a dam height of 25 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 Rock Island Lake Dam last inspected?
Rock Island Lake Dam was last inspected on August 7, 1979. Inspection dates indicate when a formal review occurred, not the results of that inspection.