Blackstone River Dam
Blackstone River Dam is a masonry dam located in Worcester County, Massachusetts. It carries a Significant hazard potential classification and has a poor condition assessment.
About Blackstone River Dam
Blackstone River Dam is a dam in Worcester, Massachusetts. The dam is owned by Last Known Owner - Dissolved - Cacoe Inc. (private). It impounds the Blackstone River near Grafton.
The dam stands 17 feet tall and stretches 350 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 100 acre-feet, and collects water from a drainage area of 92 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 04/06/2021.
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Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | Grafton |
| River/Stream | Blackstone River |
| Coordinates | 42.17768, -71.71189 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 17 ft |
| Dam Length | 350 ft |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 92 sq mi |
| Max Discharge | 5,900 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Last Known Owner - Dissolved - Cacoe Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 04/06/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00578 |
| Federal ID | MA00578 |
| More Info | State Dam Safety Program |