York Haven Main Dam Reservoir Report
Last Updated: December 8, 2025
York Haven Main Dam, located in Pennsylvania along the Susquehanna River, was completed in 1904 and serves multiple purposes including hydroelectric power generation, recreation, and water supply.
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Summary
This concrete dam stands at a height of 10 feet with a length of 7970 feet, providing a storage capacity of 7800 acre-feet and covering a surface area of 1490 acres. With a maximum discharge capacity of 362,500 cubic feet per second, the dam plays a crucial role in managing the flow of the river and ensuring water availability for various needs.
Owned by a Public Utility and regulated by the Federal Energy Regulatory Commission, York Haven Main Dam has a low hazard potential and a moderate risk assessment rating. Despite its age, the dam remains structurally sound and well-maintained, as evidenced by regular inspections and an emergency action plan in place. The dam also features an uncontrolled spillway with a width of 4970 feet, further enhancing its capacity to manage excess water and prevent flooding downstream. Overall, York Haven Main Dam stands as a vital infrastructure for sustainable water resource management and climate resilience in the region.
In addition to its functional importance, York Haven Main Dam also provides opportunities for recreational activities and contributes to the local economy. The dam's association with the Susquehanna River adds to its ecological significance, supporting diverse wildlife habitats and enhancing the natural beauty of the surrounding area. With its long-standing history and continued relevance in modern water management practices, York Haven Main Dam represents a testament to the enduring impact of hydroelectric infrastructure on both the environment and society.
Year Completed |
1904 |
Dam Length |
7970 |
Dam Height |
10 |
River Or Stream |
Susquehanna River |
Primary Dam Type |
Concrete |
Surface Area |
1490 |
Drainage Area |
24973 |
Nid Storage |
7800 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Conewago Creek Near Manchester
|
138cfs |
Codorus Creek At Pleasureville
|
208cfs |
Conewago Creek Near Bellaire
|
5cfs |
Susquehanna River At Marietta
|
12900cfs |
Yellow Breeches Creek Near Camp Hill
|
162cfs |
Swatara Creek Near Hershey
|
210cfs |
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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