Pine Tree Brook Pl-566 Flood Control Dam Reservoir Report

Last Updated: December 19, 2025

Located in Milton, Massachusetts, the Pine Tree Brook Pl-566 Flood Control Dam, also known as the Harland Street Dam, stands as a vital structure designed by the USDA NRCS to mitigate flood risk along the Pine Tree Brook.


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Summary

Completed in 1971, this earth dam with a buttress core type has a height of 21 feet and a length of 1275 feet, providing a substantial storage capacity of 1085 acre-feet and serving the primary purpose of flood risk reduction in the area.

Regulated by the Department of Conservation and Recreation in Massachusetts, this significant dam has a satisfactory condition assessment and a moderate risk level. With a drainage area of 4.5 square miles, the dam plays a crucial role in managing water flow and protecting the surrounding community from the potential impacts of flooding. Despite being uncontrolled, the spillway and outlet gates ensure proper water discharge while the dam's inspection frequency of 5 years helps to maintain its structural integrity and overall effectiveness in flood control.

For water resource and climate enthusiasts, the Pine Tree Brook Pl-566 Flood Control Dam serves as an essential infrastructure in the local area, with Ayanna Pressley representing the region in Congress. Its strategic location and design, along with its successful track record in flood risk reduction, highlight the importance of sustainable water management practices in safeguarding communities and ecosystems against the challenges of a changing climate.

Year Completed

1971

Dam Length

1275

Dam Height

21

River Or Stream

PINE TREE BROOK

Primary Dam Type

Earth

Surface Area

62

Hydraulic Height

17

Drainage Area

4.5

Nid Storage

1085

Outlet Gates

Uncontrolled

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

21
       
Seasonal Comparison

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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.