Reservoir No. 4 Dam is an earth dam located in Worcester County, Massachusetts, built in 1965. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 440 ft long, taller than 68% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Reservoir No. 4 Dam
The primary purpose of Reservoir No. 4 Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Whitinsville Water Company (private). It impounds the Cook Allen Brook near Sutton.
The dam stands 30 feet tall and stretches 440 feet across, creates a reservoir covering 11 acres, has a storage capacity of 180 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 08/08/2019.
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Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | Sutton |
| River/Stream | Cook Allen Brook |
| Coordinates | 42.11716, -71.71498 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Length | 440 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 180 acre-ft |
| Normal Storage | 180 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Whitinsville Water Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/08/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00892 |
| Federal ID | MA00892 |
| More Info | State Dam Safety Program |