Furnace Pond Dam
Furnace Pond Dam is an earth dam located in Windham County, Connecticut, built in 1870. It carries a Significant hazard potential classification and has a poor condition assessment.
About Furnace Pond Dam
The primary purpose of Furnace 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 Half Hill Brook near Killingly.
The dam stands 7 feet tall and stretches 251 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 56 acre-feet, and collects water from a drainage area of 0 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. The most recent inspection on record was 11/03/2021.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Killingly |
| River/Stream | Half Hill Brook |
| Coordinates | 41.78102, -71.86495 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 251 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 56 acre-ft |
| Max Storage | 56 acre-ft |
| Normal Storage | 56 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 248 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut DEEP |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/03/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT01669 |
| Federal ID | CT01669 |
| More Info | State Dam Safety Program |