Ash Basin No 2 Reservoir Report
Nearby: Ash Basin No 3 Ash Basin No 1
Last Updated: December 15, 2025
Ash Basin No 2 is a privately owned earth dam located in Monroe Township, Pennsylvania, with a primary purpose listed as "Other." The dam, completed in 1955, stands at a height of 136 feet and spans a length of 1800 feet, providing a storage capacity of 700 acre-feet.
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Summary
Situated on the Susquehanna River, this structure is regulated by the Pennsylvania Department of Environmental Protection and undergoes regular inspections, with the last one conducted in August 2020. Despite being classified as having a high hazard potential, the dam's condition assessment is currently listed as "Fair."
With a drainage area of 0.23 square miles, Ash Basin No 2 plays a crucial role in managing water resources in the region. The dam has been modified in 2000 for hydraulic purposes and features a buttress core type foundation. It is important to note that the dam is not associated with the US Army Corps of Engineers despite its significant role in water storage and flood control along the Susquehanna River. Water resource and climate enthusiasts will find this structure's design and function intriguing, as it represents a vital component of the local water management infrastructure.
Despite its high hazard potential, Ash Basin No 2 continues to serve as a key component in the water management system of Snyder County, Pennsylvania. With a storage capacity of 700 acre-feet, this privately owned dam provides essential flood control measures along the Susquehanna River. As climate change impacts water resources, structures like Ash Basin No 2 play a critical role in ensuring water security and mitigating potential risks associated with extreme weather events. Its fair condition assessment and regular inspections demonstrate a commitment to maintaining the dam's integrity and safeguarding the surrounding communities and ecosystems.
Years Modified |
2000 - Hydraulic |
Year Completed |
1955 |
Dam Length |
1800 |
Dam Height |
136 |
River Or Stream |
TR SUSQUEHANNA RIVER |
Primary Dam Type |
Earth |
Drainage Area |
0.23 |
Nid Storage |
700 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
136 |
Seasonal Comparison
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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.
Ash Basin No 2
Sunbury