Collinsville Dam
Collinsville Dam is a masonry dam located in Middlesex County, Massachusetts, built in 1850. It carries a Significant hazard potential classification and has a poor condition assessment.
About Collinsville Dam
Collinsville Dam is a dam in Middlesex, Massachusetts. The dam is owned by Mill Island, Llc (private). It impounds the Beaver Brook near Dracut.
The dam stands 9 feet tall and stretches 280 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 160 acre-feet, and collects water from a drainage area of 87 square miles. Completed in 1850, 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 03/08/2023.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Dracut |
| River/Stream | Beaver Brook |
| Coordinates | 42.68325, -71.34938 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 9 ft |
| Dam Length | 280 ft |
| Year Completed | 1850 (176 years old) |
Storage & Hydraulics
| NID Storage | 160 acre-ft |
| Max Storage | 160 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 87 sq mi |
| Max Discharge | 2,020 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Mill Island, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 03/08/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA00839 |
| Federal ID | MA00839 |
| More Info | State Dam Safety Program |