St Marys Pond
Key Takeaway
St Marys Pond is classified as high hazard in Rhode Island. It was completed in 1878 and is 148 years old. Its primary use is water supply. 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 | 12 ft (taller than 49.1% in RI) |
| Dam Length | 2,288 ft |
| Dam Type | Rockfill |
| Max Storage | 1.2K acre-ft |
| Normal Storage | 1.0K acre-ft |
| Surface Area | 117 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 375 cfs |
| Year Completed | 1878 (148 years old) |
| NID ID | RI02703 |
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
NEWPORT, CITY OF
Local Government
Nearby Dams
Sisson Pond
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High Hazard 14 ftLawton Valley Reservoir
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High Hazard 39 ftMelville #1
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Significant HazardEaston Pond North
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High Hazard 14 ftNelson Pond
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High Hazard 17 ftEaston Pond South
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High Hazard 13 ftGardiner Pond
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High Hazard 20 ftNonquit Pond
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Significant Hazard 8 ftFrequently Asked Questions
What is the hazard classification of St Marys Pond?
St Marys Pond 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 St Marys Pond?
St Marys Pond is owned by NEWPORT, CITY OF (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was St Marys Pond built?
St Marys Pond was completed in 1878, making it 148 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 St Marys Pond?
St Marys Pond 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 St Marys Pond?
St Marys Pond has a dam height of 12 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 St Marys Pond last inspected?
St Marys Pond was last inspected on September 12, 2013. Inspection dates indicate when a formal review occurred, not the results of that inspection.