Arrigoni Pond Dam is an earth dam located in Middlesex County, Connecticut, built in 1945. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 21 ft21 ft tall and 100 ft long. 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 Arrigoni Pond Dam
The primary purpose of Arrigoni Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Richard and Kathryn Spero (private). It impounds the Hammonasset River near Durham.
The dam stands 21 feet tall and stretches 100 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 83 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1945, the structure is well-established, with more than 75 years of service.
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 11/22/2019.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Durham |
| River/Stream | Hammonasset River |
| Coordinates | 41.44156, -72.64095 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 100 ft |
| Year Completed | 1945 (81 years old) |
Storage & Hydraulics
| NID Storage | 83 acre-ft |
| Max Storage | 83 acre-ft |
| Normal Storage | 83 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 182 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Richard and Kathryn Spero |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/22/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00384 |
| Federal ID | CT00384 |
| More Info | State Dam Safety Program |