Locust Pond Dam
Locust Pond Dam is a gravity dam located in Middlesex County, Massachusetts, built in 1949. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Locust Pond Dam
The primary purpose of Locust Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Washburn Pond, Llc (private). It impounds the Unnamed Stream Entirely In Tyngsboro near Tyngsborough.
The dam stands 14 feet tall and stretches 100 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1949, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 09/28/2015. That was over 10 years ago.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Tyngsborough |
| River/Stream | Unnamed Stream Entirely In Tyngsboro |
| Coordinates | 42.69055, -71.43519 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 14 ft |
| Dam Length | 100 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Washburn Pond, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/28/2015 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA00831 |
| Federal ID | MA00831 |
| More Info | State Dam Safety Program |