Great Hill Pond Dam
Great Hill Pond Dam is an earth dam located in Middlesex County, Connecticut, built in 1870. It carries a Significant hazard potential classification and has a poor condition assessment.
About Great Hill Pond Dam
The primary purpose of Great Hill Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Connecticut Deep (state). It impounds the Great Hill Pond Brook near Portland.
The dam stands 14 feet tall and stretches 193 feet across, creates a reservoir covering 71 acres, has a maximum storage capacity of 358 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1870, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 09/29/2020.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Portland |
| River/Stream | Great Hill Pond Brook |
| Coordinates | 41.57283, -72.56153 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 193 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 358 acre-ft |
| Max Storage | 358 acre-ft |
| Normal Storage | 358 acre-ft |
| Surface Area | 71 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 344 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut DEEP |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 09/29/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00150 |
| Federal ID | CT00150 |
| More Info | State Dam Safety Program |