Tioga Dam Reservoir Report

Last Updated: December 8, 2025

Tioga Dam, located in Tioga, Pennsylvania, was completed in 1978 by the US Army Corps of Engineers as a rockfill dam along the Tioga River.


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Summary

With a height of 140.5 feet and a storage capacity of 143,383 acre-feet, the primary purpose of the dam is flood risk reduction, although it also serves recreational purposes. While the dam reduces the risk of downstream flooding, there are still potential hazards, with the most likely scenario being a high-volume release of water during significant storm events that could lead to flooding in downstream communities.

To manage and reduce the risk to downstream communities, the US Army Corps of Engineers conducts regular inspections and monitoring of the dam, especially during high water events. They maintain an Emergency Action Plan and perform emergency response exercises to stay prepared for potential flood events. Additionally, they closely monitor rainfall forecasts to provide early warnings of high water events. Despite the risk, Tioga Dam remains a critical structure for flood risk reduction in the region, safeguarding communities along the Tioga, Chemung, and North Branch Susquehanna Rivers.

Year Completed

1978

Dam Length

2710

Dam Height

140.5

River Or Stream

TIOGA RIVER

Primary Dam Type

Rockfill

Surface Area

498

Hydraulic Height

136.1

Drainage Area

280

Nid Storage

143383

Structural Height

140

Hazard Potential

High

Foundations

Rock and Soil

Nid Height

141
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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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