Simmons Upper Reservoir
Key Takeaway
Simmons Upper Reservoir is classified as high hazard in Rhode Island. It was completed in 1865 and is 161 years old. Its primary use is debris control. 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 71.6% in RI) |
| Dam Length | 650 ft |
| Dam Type | Masonry |
| Max Storage | 430 acre-ft |
| Normal Storage | 384 acre-ft |
| Surface Area | 48 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 375 cfs |
| Year Completed | 1865 (161 years old) |
| NID ID | RI01602 |
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
JOHNSTON, TOWN OF
Local Government
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Significant Hazard 11 ftFrequently Asked Questions
What is the hazard classification of Simmons Upper Reservoir?
Simmons Upper Reservoir 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 Simmons Upper Reservoir?
Simmons Upper Reservoir is owned by JOHNSTON, TOWN OF (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Simmons Upper Reservoir built?
Simmons Upper Reservoir was completed in 1865, making it 161 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 Simmons Upper Reservoir?
Simmons Upper Reservoir serves the following purposes: Debris Control. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Simmons Upper Reservoir?
Simmons Upper Reservoir 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 Simmons Upper Reservoir last inspected?
Simmons Upper Reservoir was last inspected on September 9, 2010. Inspection dates indicate when a formal review occurred, not the results of that inspection.