East Mountain Reservoir Dam is an earth dam located in Berkshire County, Massachusetts. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 200 ft long. 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 East Mountain Reservoir Dam
The primary purpose of East Mountain 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 Great Barrington (local government). It impounds the Unnamed Brook near Great Barrington.
The dam stands 20 feet tall and stretches 200 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 27 acre-feet, and collects water from a drainage area of 0 square miles.
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 10/28/2021.
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Location
| State | Massachusetts |
| County | Berkshire |
| Nearest City | Great Barrington |
| River/Stream | Unnamed Brook |
| Coordinates | 42.18794, -73.35069 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Length | 200 ft |
Storage & Hydraulics
| NID Storage | 27 acre-ft |
| Max Storage | 27 acre-ft |
| Normal Storage | 15 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 440 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Town of Great Barrington |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/28/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA02611 |
| Federal ID | MA02611 |
| More Info | State Dam Safety Program |