Siscowit Reservoir Dam
Siscowit Reservoir Dam is an earth dam located in Fairfield County, Connecticut, built in 1865. It carries a Significant hazard potential classification and has a fair condition assessment.
About Siscowit Reservoir Dam
The primary purpose of Siscowit 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 Aquarion Water Company Of Connecticut (public utility). It impounds the Rippowam River near New Canaan.
The dam stands 6 feet tall and stretches 95 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 270 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1865, the structure is one of the older dams in the region, with over a century and a half 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 05/16/2024.
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Location
| State | Connecticut |
| County | Fairfield |
| Nearest City | New Canaan |
| River/Stream | Rippowam River |
| Coordinates | 41.19302, -73.52409 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 6 ft |
| Dam Height | 6 ft |
| Dam Length | 95 ft |
| Year Completed | 1865 (161 years old) |
Storage & Hydraulics
| NID Storage | 270 acre-ft |
| Max Storage | 270 acre-ft |
| Normal Storage | 270 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 3 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Aquarion Water Company of Connecticut |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/16/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00056 |
| Federal ID | CT00056 |
| More Info | State Dam Safety Program |