Lower Sibley Pond Dam
Lower 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 Lower Sibley Pond Dam
The primary purpose of Lower 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 Last Known Owner - Deceased - Catherine C. Gauthier (private). It impounds the Ashworth Brook near Charlton.
The dam stands 14 feet tall and stretches 230 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 149 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. An emergency action plan is in place for this dam. The most recent inspection on record was 02/24/2020.
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Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | Charlton |
| River/Stream | Ashworth Brook |
| Coordinates | 42.14487, -72.00608 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Length | 230 ft |
Storage & Hydraulics
| NID Storage | 149 acre-ft |
| Max Storage | 149 acre-ft |
| Normal Storage | 112 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 205 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Last Known Owner - Deceased - Catherine C. Gauthier |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 02/24/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00099 |
| Federal ID | MA00099 |
| More Info | State Dam Safety Program |