Potomac Dam No. 5 Reservoir Report
Last Updated: December 5, 2025
Potomac Dam No.
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Summary
5, located in Williamsport, Maryland, is a Federal-owned structure managed by the National Park Service. This earth dam, completed in 1830, serves multiple purposes including providing a fish and wildlife pond, hydroelectric power, and recreational opportunities. With a height of 20 feet and a storage capacity of 4,900 acre-feet, the dam plays a crucial role in managing the flow of the Potomac River and supporting the surrounding ecosystem.
The dam's significant hazard potential and moderate risk assessment highlight the importance of regular inspections and maintenance to ensure its structural integrity and safety. While the last inspection was conducted in September 2015, the dam is regulated by the Maryland Dam Safety agency and the National Park Service, with state permitting, inspection, and enforcement in place. The dam's uncontrolled spillway, with a width of 711 feet, allows for the controlled release of excess water during periods of high flow, protecting downstream areas from potential flooding.
As a key feature in the management of water resources in the region, Potomac Dam No. 5 serves as a vital link in the conservation efforts of the Potomac River. Its role in supporting fish and wildlife habitats, providing recreational opportunities, and contributing to hydroelectric power generation underscores the importance of ongoing monitoring and maintenance to ensure its continued functionality and safety for both the environment and the community.
Year Completed |
1830 |
Dam Height |
20 |
River Or Stream |
POTOMAC RIVER |
Primary Dam Type |
Earth |
Surface Area |
490 |
Drainage Area |
5100 |
Nid Storage |
4900 |
Outlet Gates |
Slide (sluice gate) - 0 |
Hazard Potential |
Significant |
Nid Height |
20 |
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.
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