Hamburg Flood Control (Pa-476) Reservoir Report

Last Updated: December 6, 2025

The Hamburg Flood Control (Pa-476) dam, located in Windsor Township, Berks County, Pennsylvania, was completed in 1965 by the USDA NRCS for the primary purpose of flood risk reduction along the TR Mill Creek.


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Summary

Standing at a height of 46 feet and a length of 400 feet, this earth dam provides a maximum storage capacity of 102 acre-feet to protect the surrounding area from potential flooding events. The dam is regulated and permitted by the Pennsylvania Department of Environmental Protection, ensuring its structural integrity and effectiveness in managing water levels during periods of high discharge.

Managed by the local government, this flood control structure is inspected annually to monitor its condition, with the latest assessment in November 2020 rating its state as fair. With a high hazard potential due to its location and purpose, the Hamburg Flood Control dam plays a crucial role in safeguarding the community against flood risks. While no emergency action plan (EAP) or inundation maps are currently in place, the dam's design and construction by the USDA NRCS demonstrate a commitment to effective flood control measures in the region. As a key component in the flood risk reduction strategy for the area, the Hamburg Flood Control (Pa-476) dam remains a vital asset in protecting against potential water-related disasters.

Year Completed

1965

Dam Length

400

Dam Height

46

River Or Stream

TR MILL CREEK

Primary Dam Type

Earth

Surface Area

1

Drainage Area

0.5

Nid Storage

102

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

46
       
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.