Osborne Lagoon Reservoir Report
Nearby: Wastewater Treatment Pine Grove
Last Updated: December 19, 2025
Osborne Lagoon in Lower Oxford Township, Pennsylvania, is a significant earth dam completed in 2012 with a height of 49.5 feet and a storage capacity of 118.5 acre-feet.
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Summary
Managed by the Pennsylvania Department of Environmental Protection, this dam plays a crucial role in regulating water flow in the WTRSHD Leech Run watershed. Despite its substantial hazard potential, Osborne Lagoon is in satisfactory condition according to the last inspection in 2014, with a mandated inspection frequency of every two years.
The dam's primary purpose is designated as "Other," indicating its multifunctional role in water resource management. With a drainage area of just 0.01 square miles, Osborne Lagoon serves as a vital infrastructure for flood control and water storage in the region. Located in Chester County, Pennsylvania, this dam contributes to the overall resilience of the local water supply and helps mitigate the impacts of extreme weather events on the surrounding communities. As water resource and climate enthusiasts, understanding the role and condition of dams like Osborne Lagoon is crucial in ensuring sustainable water management practices for a changing climate.
With its designer names undisclosed and no federal agency involvement in its ownership or operation, Osborne Lagoon remains under the jurisdiction of the Pennsylvania Department of Environmental Protection. Despite its significant hazard potential, the dam's satisfactory condition and regular inspections suggest a proactive approach to maintaining its structural integrity and ensuring public safety. As advocates for sustainable water resource management, monitoring the condition and functionality of vital water infrastructure like Osborne Lagoon is essential in adapting to the challenges posed by a changing climate and ensuring the resilience of our water resources for future generations.
Year Completed |
2012 |
Dam Length |
2218 |
Dam Height |
49.5 |
River Or Stream |
WTRSHD LEECH RUN |
Primary Dam Type |
Earth |
Drainage Area |
0.01 |
Nid Storage |
118.5 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
50 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Osborne Lagoon