Marsh Creek Reservoir (Pa-437) Reservoir Report

Last Updated: December 6, 2025

Marsh Creek Reservoir (Pa-437) in Chester, Pennsylvania is a state-owned water resource managed by the Pennsylvania Department of Environmental Protection.


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Summary

Built in 1973 by AandE-Gannett Fleming, this Earth-type dam serves multiple purposes including flood risk reduction, recreation, and water supply. With a height of 90 feet and a storage capacity of 24,000 acre-feet, the reservoir covers 535 acres and has a drainage area of 20 square miles.

Located in Upper Uwchlan Township, Marsh Creek Reservoir is a popular recreational spot offering activities such as fishing, boating, and hiking. The dam's hazard potential is rated as high, but its condition assessment is marked as fair. Regular inspections are conducted to ensure the safety and functionality of the structure, with the last inspection taking place in July 2020. The reservoir plays a crucial role in water management and conservation efforts in the region, providing both recreational opportunities and essential water supply for the community.

Managed by state regulators and meeting all necessary permitting and inspection requirements, Marsh Creek Reservoir is a key asset in the water infrastructure of Pennsylvania. With its tranquil setting and diverse ecological benefits, the reservoir serves as a vital resource for residents and visitors alike. Climate enthusiasts and water resource advocates can appreciate the strategic design and management of this reservoir in balancing flood control, recreation, and water supply needs in the region.

Year Completed

1973

Dam Length

990

Dam Height

90

River Or Stream

MARSH CREEK

Primary Dam Type

Earth

Surface Area

535

Drainage Area

20

Nid Storage

24000

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

90
       
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.