Prospect Lake Dam
Prospect Lake Dam is a concrete dam located in Berkshire County, Massachusetts. It carries a Significant hazard potential classification and has a poor condition assessment.
About Prospect Lake Dam
The primary purpose of Prospect Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Dam Llc (private). It impounds the Prospect Brook near Egremont.
The dam stands 6 feet tall and stretches 300 feet across, creates a reservoir covering 57 acres, has a maximum storage capacity of 437 acre-feet, and collects water from a drainage area of 1 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 04/14/2023.
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Location
| State | Massachusetts |
| County | Berkshire |
| Nearest City | Egremont |
| River/Stream | Prospect Brook |
| Coordinates | 42.19673, -73.44894 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 6 ft |
| Dam Length | 300 ft |
Storage & Hydraulics
| NID Storage | 437 acre-ft |
| Max Storage | 437 acre-ft |
| Normal Storage | 350 acre-ft |
| Surface Area | 57 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 331 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Dam LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 04/14/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00023 |
| Federal ID | MA00023 |
| More Info | State Dam Safety Program |