Three Rivers
Key Takeaway
Three Rivers is classified as high hazard in Michigan. It was completed in 1917 and is 109 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 | 16 ft (taller than 55.7% in MI) |
| Dam Length | 1,322 ft |
| Dam Type | Gravity |
| Max Storage | 902 acre-ft |
| Normal Storage | 902 acre-ft |
| Surface Area | 601 acres |
| Drainage Area | 985 sq mi |
| Max Discharge | 22,500 cfs |
| Year Completed | 1917 (109 years old) |
| NID ID | MI00395 |
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
Grande Pointe Power
Private
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What is the hazard classification of Three Rivers?
Three Rivers 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 Three Rivers?
Three Rivers is owned by Grande Pointe Power (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Three Rivers built?
Three Rivers was completed in 1917, making it 109 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 Three Rivers?
Three Rivers serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Three Rivers?
Three Rivers has a dam height of 16 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 Three Rivers last inspected?
Three Rivers was last inspected on August 30, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.