Locust Pond Dam Reservoir Report

Last Updated: December 17, 2025

Locust Pond Dam, located in Tyngsborough, Massachusetts, is a privately owned structure with a primary purpose of recreation.


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Summary

Completed in 1949, this gravity dam stands at a height of 14 feet and has a NID storage capacity of 135 acre-feet. The dam overlooks an unnamed stream entirely within Tyngsborough and serves as a recreational spot for water resource and climate enthusiasts in the area.

Managed by the Department of Conservation and Recreation, the Locust Pond Dam is regulated, inspected, and enforced by the state of Massachusetts. With a significant hazard potential and a satisfactory condition assessment as of September 2015, the dam poses a moderate risk level (3) according to the data. Despite lacking certain emergency preparedness measures like an EAP, the dam continues to provide a valuable recreational resource for the community, with a surface area of 19.2 acres and a normal storage capacity of 72 acre-feet.

Overall, Locust Pond Dam serves as a notable structure in Middlesex County, Massachusetts, offering both recreational opportunities and a source of water storage for the surrounding area. With its historic significance dating back to the mid-20th century, the dam remains a focal point for water resource and climate enthusiasts seeking to explore and appreciate the natural beauty of the region.

Year Completed

1949

Dam Length

100

Dam Height

14

River Or Stream

UNNAMED STREAM ENTIRELY IN TYNGSBORO

Primary Dam Type

Gravity

Surface Area

19.2

Hydraulic Height

13

Drainage Area

1.72

Nid Storage

135

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

14
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.