Graniss Pond Dam is an earth dam located in New Haven County, Connecticut, built in 1900. It carries a Significant hazard potential classification.
Dam profile
NID height · 6 ft6 ft tall and 600 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 Graniss Pond Dam
The primary purpose of Graniss Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Grannis Lake Estates Owner Association (private). It impounds the Farm River Trib near East Haven.
The dam stands 6 feet tall and stretches 600 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 220 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1900, 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. The most recent inspection on record was 12/05/1995. That was over 30 years ago.
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Location
| State | Connecticut |
| County | New Haven |
| Nearest City | East Haven |
| River/Stream | Farm River Trib |
| Coordinates | 41.30394, -72.85546 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 6 ft |
| Dam Height | 6 ft |
| Dam Length | 600 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Max Storage | 220 acre-ft |
| Normal Storage | 220 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Grannis Lake Estates Owner Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 12/05/1995 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00114 |
| Federal ID | CT00114 |
| More Info | State Dam Safety Program |