Upper Glen Reservoir Dam
Upper Glen Reservoir Dam is a concrete dam located in Franklin County, Massachusetts, built in 1904. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Upper Glen Reservoir Dam
The primary purpose of Upper Glen 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 City Of Greenfield (local government). It impounds the Glen Brook near Leyden.
The dam stands 59 feet tall and stretches 243 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 143 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1904, 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 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 06/24/2021.
At 59 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Massachusetts |
| County | Franklin |
| Nearest City | Leyden |
| River/Stream | Glen Brook |
| Coordinates | 42.66092, -72.61661 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 59 ft |
| Dam Length | 243 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 143 acre-ft |
| Max Storage | 143 acre-ft |
| Normal Storage | 92 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 4,400 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Greenfield |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/24/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00049 |
| Federal ID | MA00049 |
| More Info | State Dam Safety Program |