Tyrone Power Company Dam Reservoir Report
Nearby: Richard Pulver Dam Bradford Dam
Last Updated: December 25, 2025
The Tyrone Power Company Dam, also known as Green Valley Lake, is a private dam located in Tyrone, New York.
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Summary
Completed in 1953, this concrete structure serves as a vital flood risk reduction measure along the Tobehanna Creek. With a height of 20 feet and a length of 135 feet, the dam has a storage capacity of 700 acre-feet, with a normal storage level of 340 acre-feet. The dam's primary purpose is flood risk reduction, with secondary benefits including recreation opportunities.
Despite its importance in mitigating flood risks, the Tyrone Power Company Dam has a high hazard potential and is currently assessed as being in poor condition. The last inspection in September 2019 revealed the need for maintenance and improvements to ensure the dam's safety and functionality. The dam's spillway, with a width of 50 feet, is uncontrolled, posing additional challenges in managing water flow during high-risk scenarios. The risk assessment for the dam is moderate, indicating the need for ongoing monitoring and management measures to address potential vulnerabilities.
Water resource and climate enthusiasts will find the Tyrone Power Company Dam an intriguing case study in the complex interplay between infrastructure, environmental protection, and community safety. As a privately-owned structure regulated by the New York State Department of Environmental Conservation, the dam represents a critical piece of the region's flood management strategy. Understanding the challenges and opportunities associated with maintaining and improving such dams is essential for ensuring the resilience of water resources and the communities they serve in the face of climate change and increasing water-related risks.
Year Completed |
1953 |
Dam Length |
135 |
Dam Height |
20 |
River Or Stream |
TOBEHANNA CREEK |
Primary Dam Type |
Concrete |
Surface Area |
117 |
Drainage Area |
11.8 |
Nid Storage |
700 |
Hazard Potential |
High |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cohocton River Near Campbell Ny
|
163cfs |
Chemung River At Corning Ny
|
142cfs |
Cohocton River At Avoca Ny
|
81cfs |
Keuka Lake Outlet At Dresden Ny
|
102cfs |
Tioga River Near Erwins Ny
|
761cfs |
Canisteo River At West Cameron Ny
|
162cfs |
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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Tyrone Power Company Dam