Threemile Pond Dam is an earth dam located in Berkshire County, Massachusetts, built in 1968. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 17 ft17 ft tall and 980 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 Threemile Pond Dam
The primary purpose of Threemile Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ma Department of Fish and Game (state). It impounds the Ironwork Brook near Sheffield.
The dam stands 17 feet tall and stretches 980 feet across, creates a reservoir covering 83 acres, has a maximum storage capacity of 1,240 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1968, 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 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 05/13/2020.
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Location
| State | Massachusetts |
| County | Berkshire |
| Nearest City | Sheffield |
| River/Stream | Ironwork Brook |
| Coordinates | 42.13545, -73.30805 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Length | 980 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 1,240 acre-ft |
| Max Storage | 1,240 acre-ft |
| Normal Storage | 340 acre-ft |
| Surface Area | 83 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 140 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ma Department of Fish and Game |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/13/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00042 |
| Federal ID | MA00042 |
| More Info | State Dam Safety Program |