Assabet River Dam is a gravity dam located in Middlesex County, Massachusetts, built in 1924. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 140 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Assabet River Dam
The primary purpose of Assabet River Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by F. L. B., Inc. (private). It impounds the Assabet River near Stow.
The dam stands 15 feet tall and stretches 140 feet across, has a maximum storage capacity of 124 acre-feet, and collects water from a drainage area of 75 square miles. Completed in 1924, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 08/05/2009. That was over 17 years ago.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Stow |
| River/Stream | Assabet River |
| Coordinates | 42.40702, -71.52647 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 15 ft |
| Dam Length | 140 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 124 acre-ft |
| Max Storage | 124 acre-ft |
| Normal Storage | 29 acre-ft |
| Drainage Area | 75 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | F. L. B., Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/05/2009 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA00820 |
| Federal ID | MA00820 |
| More Info | State Dam Safety Program |