Brook Crossing Detention Reservoir Report

Last Updated: December 6, 2025

Brook Crossing Detention is a flood risk reduction structure located in East Fallowfield Township, Chester County, Pennsylvania.


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Summary

This earth dam, with a height of 10.5 feet and a length of 350 feet, serves to manage floodwaters from the TR Dennis Run. The dam has a storage capacity of 10 acre-feet and a drainage area of 0.18 square miles.

The dam was last inspected in October 2017 and was assessed to be in fair condition, with a significant hazard potential. While the dam has not been modified since 2003, it is regulated by the Pennsylvania Department of Environmental Protection and undergoes regular inspections. The risk assessment for Brook Crossing Detention is moderate, indicating the need for ongoing monitoring and maintenance to ensure its effectiveness in flood risk reduction.

With its critical role in protecting the surrounding area from flooding, Brook Crossing Detention exemplifies the importance of water resource management and climate adaptation efforts. Climate enthusiasts and water resource experts can appreciate the design and function of this earth dam, as well as the regulatory oversight and maintenance protocols in place to safeguard the community from potential hazards.

Years Modified

2003 - Hydraulic

Dam Length

350

Dam Height

10.5

River Or Stream

TR DENNIS RUN

Primary Dam Type

Earth

Drainage Area

0.18

Nid Storage

10

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

11
       
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.