Laurel Run Reservoir Reservoir Report
Last Updated: December 13, 2025
Laurel Run Reservoir, located in the City of St.
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Summary
Marys, Pennsylvania, serves as a vital water supply source for the local community. This Earth-type dam, completed in 1970, stands at a height of 84 feet and boasts a storage capacity of 3,682 acre-feet. Despite its significant role in providing water for the region, the reservoir's condition assessment is marked as poor, with a high hazard potential.
The Pennsylvania Department of Environmental Protection regulates and inspects Laurel Run Reservoir, ensuring its compliance with state laws and safety standards. The reservoir covers a surface area of 92 acres and is situated on the Laurel Run river, with a drainage area of 8.8 square miles. With a maximum storage capacity of 3,682 acre-feet and a normal storage level of 2,679 acre-feet, the reservoir plays a crucial role in meeting the water supply needs of the surrounding population.
While Laurel Run Reservoir continues to provide essential water resources for the City of St. Marys, its poor condition and high hazard potential highlight the importance of ongoing maintenance and risk management measures. As a key component of the local water supply infrastructure, the reservoir's upkeep and regulatory oversight are crucial to ensuring a sustainable and reliable water source for the community in the face of changing climate conditions.
Year Completed |
1970 |
Dam Length |
1124 |
Dam Height |
84 |
River Or Stream |
LAUREL RUN |
Primary Dam Type |
Earth |
Surface Area |
92 |
Drainage Area |
8.8 |
Nid Storage |
3682 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
84 |
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.
Laurel Run Reservoir