Upper Westborough Reservoir Dam
Upper Westborough Reservoir Dam is an earth dam located in Worcester County, Massachusetts, built in 1887. It carries a Significant hazard potential classification and has a fair condition assessment.
About Upper Westborough Reservoir Dam
The primary purpose of Upper Westborough Reservoir 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 Town Of Westborough (local government). It impounds the Piccadilly Brook near Westborough.
The dam stands 15 feet tall and stretches 300 feet across, creates a reservoir covering 60 acres, has a maximum storage capacity of 840 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1887, the structure is over a century 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 12/19/2023.
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Location
| State | Massachusetts |
| County | Worcester |
| Nearest City | Westborough |
| River/Stream | Piccadilly Brook |
| Coordinates | 42.24315, -71.60348 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 300 ft |
| Year Completed | 1887 (139 years old) |
Storage & Hydraulics
| NID Storage | 840 acre-ft |
| Max Storage | 840 acre-ft |
| Normal Storage | 785 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 160 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Town of Westborough |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 12/19/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00940 |
| Federal ID | MA00940 |
| More Info | State Dam Safety Program |