Upper Mill Pond Dam is an earth dam located in Middlesex County, Connecticut, built in 1860. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 300 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 Upper Mill Pond Dam
The primary purpose of Upper Mill Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Fenner Drives, Inc. (private). It impounds the Sumner Brook near Middletown.
The dam stands 12 feet tall and stretches 300 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 36 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1860, 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 08/30/2023.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Middletown |
| River/Stream | Sumner Brook |
| Coordinates | 41.54321, -72.63834 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 300 ft |
| Year Completed | 1860 (166 years old) |
Storage & Hydraulics
| NID Storage | 36 acre-ft |
| Max Storage | 36 acre-ft |
| Normal Storage | 31 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 250 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Fenner Drives, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/30/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00141 |
| Federal ID | CT00141 |
| More Info | State Dam Safety Program |