Spahn Pond Dam is a masonry dam located in Fairfield County, Connecticut, built in 1925. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 40 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Spahn Pond Dam
The primary purpose of Spahn Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by 552 Lake Avenue Limited Partnership;jonas (private). It impounds the Horseneck Brook near Greenwich.
The dam stands 12 feet tall and stretches 40 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1925, 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. The most recent inspection on record was 11/07/2020.
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Location
| State | Connecticut |
| County | Fairfield |
| Nearest City | Greenwich |
| River/Stream | Horseneck Brook |
| Coordinates | 41.05771, -73.64038 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 40 ft |
| Year Completed | 1925 (101 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 11 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | 552 Lake Avenue Limited Partnership;jonas |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/07/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00537 |
| Federal ID | CT00537 |
| More Info | State Dam Safety Program |