Quonnipaug Lake Dam
Quonnipaug Lake Dam is a masonry dam located in New Haven County, Connecticut, built in 1850. It carries a Significant hazard potential classification and has a poor condition assessment.
About Quonnipaug Lake Dam
The primary purpose of Quonnipaug Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Guilford (local government). It impounds the West River near Guilford.
The dam stands 5 feet tall and stretches 110 feet across, creates a reservoir covering 111 acres, has a maximum storage capacity of 336 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1850, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 02/12/2020.
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Location
| State | Connecticut |
| County | New Haven |
| Nearest City | Guilford |
| River/Stream | West River |
| Coordinates | 41.37999, -72.70557 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 5 ft |
| Dam Height | 5 ft |
| Dam Length | 110 ft |
| Year Completed | 1850 (176 years old) |
Storage & Hydraulics
| NID Storage | 336 acre-ft |
| Max Storage | 336 acre-ft |
| Normal Storage | 336 acre-ft |
| Surface Area | 111 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 53 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Guilford |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 02/12/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00411 |
| Federal ID | CT00411 |
| More Info | State Dam Safety Program |