Upper Sibley Pond Dam
Upper Sibley Pond Dam is an earth dam located in Worcester County, Massachusetts. It carries a Significant hazard potential classification and has a poor condition assessment.
About Upper Sibley Pond Dam
The primary purpose of Upper Sibley Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Upper Sibley Pond Realty Trust (private). It impounds the Ashworth Brook near Charlton.
The dam stands 12 feet tall, creates a reservoir covering 25 acres, has a maximum storage capacity of 200 acre-feet, and collects water from a drainage area of 2 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/03/2019.
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Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | Charlton |
| River/Stream | Ashworth Brook |
| Coordinates | 42.14837, -72.00935 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Normal Storage | 125 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Upper Sibley Pond Realty Trust |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/03/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA00100 |
| Federal ID | MA00100 |
| More Info | State Dam Safety Program |