Lower Unionville Reservoir Dam is an earth dam located in Hartford County, Connecticut. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 175 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 Lower Unionville Reservoir Dam
The primary purpose of Lower Unionville Reservoir 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 Avon (local government). It impounds the Hawley Brook Tributary to Farmington River.
The dam stands 16 feet tall and stretches 175 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 0 acre-feet, and collects water from a drainage area of 0 square miles.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 11/30/2023.
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Location
| State | Connecticut |
| County | Hartford |
| River/Stream | Hawley Brook Tributary to Farmington River |
| Coordinates | 41.78504, -72.90826 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 175 ft |
Storage & Hydraulics
| NID Storage | 5 acre-ft |
| Max Storage | 0 acre-ft |
| Normal Storage | 5 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Avon |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/30/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00687 |
| Federal ID | CT00687 |
| More Info | State Dam Safety Program |