Stillwater Reservoir
Key Takeaway
Stillwater Reservoir is classified as high hazard in Rhode Island. It was completed in 1918 and is 108 years old. Its primary use is fish and wildlife pond. 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 | 20 ft (taller than 82% in RI) |
| Dam Length | 670 ft |
| Dam Type | Concrete |
| Max Storage | 3.9K acre-ft |
| Normal Storage | 2.4K acre-ft |
| Surface Area | 240 acres |
| Drainage Area | 26 sq mi |
| Max Discharge | 1,800 cfs |
| Year Completed | 1918 (108 years old) |
| NID ID | RI03101 |
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
RI DEM FISH & WILDLIFE
State Government
Nearby Dams
Stillwater Pond
Providence, RI
Significant Hazard 18 ftCapron Pond
Providence, RI
Low Hazard 13 ftSprague Lower Reservoir
Providence, RI
High Hazard 15 ftMountaindale Reservoir
Providence, RI
Low Hazard 10 ftSprague Upper Reservoir
Providence, RI
High Hazard 25 ftStillwater Mill Pond
Providence, RI
Low Hazard 15 ftGeorgiaville Pond
Providence, RI
High Hazard 33 ftHopkins Pond
Providence, RI
High Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Stillwater Reservoir?
Stillwater 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 Stillwater Reservoir?
Stillwater Reservoir is owned by RI DEM FISH & WILDLIFE (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Stillwater Reservoir built?
Stillwater Reservoir was completed in 1918, making it 108 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 Stillwater Reservoir?
Stillwater Reservoir serves the following purposes: Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Stillwater Reservoir?
Stillwater Reservoir has a dam height of 20 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 Stillwater Reservoir last inspected?
Stillwater Reservoir was last inspected on August 15, 2014. Inspection dates indicate when a formal review occurred, not the results of that inspection.