Cow Pond Brook Dam
Cow Pond Brook Dam is a stone dam located in Middlesex County, Massachusetts. It carries a Significant hazard potential classification and has a fair condition assessment.
About Cow Pond Brook Dam
The primary purpose of Cow Pond Brook Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Massapoag Rod And Gun Club, Inc. (private). It impounds the Salmon Brook near Tyngsborough.
The dam stands 13 feet tall and stretches 60 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 185 acre-feet, and collects water from a drainage area of 10 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 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 05/27/2021.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Tyngsborough |
| River/Stream | Salmon Brook |
| Coordinates | 42.63780, -71.49686 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 13 ft |
| Dam Length | 60 ft |
Storage & Hydraulics
| NID Storage | 185 acre-ft |
| Max Storage | 185 acre-ft |
| Normal Storage | 171 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 114 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Massapoag Rod and Gun Club, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/27/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00832 |
| Federal ID | MA00832 |
| More Info | State Dam Safety Program |