Stone Hill Reservoir Dam is an earth dam located in New London County, Connecticut, built in 1894. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 35 ft35 ft tall and 470 ft long, taller than 80% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Stone Hill Reservoir Dam
The primary purpose of Stone Hill Reservoir Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Jewett City Water Company (public utility). It impounds the Reservoir Brook, , Quinebaug River Basin near Griswold.
The dam stands 35 feet tall and stretches 470 feet across, creates a reservoir covering 30 acres, has a storage capacity of 1,000 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1894, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/15/2023.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | Griswold |
| River/Stream | Reservoir Brook, , Quinebaug River Basin |
| Coordinates | 41.63040, -71.90097 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 470 ft |
| Year Completed | 1894 (132 years old) |
Storage & Hydraulics
| NID Storage | 1,000 acre-ft |
| Normal Storage | 1,000 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Jewett City Water Company |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/15/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00436 |
| Federal ID | CT00436 |
| More Info | State Dam Safety Program |