Blenheim - Gilboa Upper Reservoir Report
Last Updated: December 7, 2025
Located in North Blenheim, New York, the Blenheim-Gilboa Upper dam is a state-owned structure designed by Chas.
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Summary
T. Main for hydroelectric purposes on the Schoharie Creek. Completed in 1974, this earth dam stands at a height of 110 feet and has a structural height of 170 feet, with a length of 11,900 feet. With a storage capacity of 18,500 acre-feet, the dam covers a surface area of 355 acres and has a maximum discharge of 10,200 cubic feet per second.
Managed by the Federal Energy Regulatory Commission, the Blenheim-Gilboa Upper dam serves as a vital source of hydroelectric power and recreation in the area. The dam has a spillway width of 700 feet and a high hazard potential, with a moderate risk assessment. While the condition assessment is not available, the dam undergoes regular inspections with a frequency of 1 year, with the last inspection conducted in September 2020. Emergency action plans have been prepared and updated, ensuring the safety of surrounding communities in case of any unforeseen events.
Overall, the Blenheim-Gilboa Upper dam is a significant infrastructure contributing to water resource management and climate resilience in Schoharie, New York. Its strategic location and design make it a key player in providing renewable energy and recreational opportunities, while also prioritizing safety and risk management through regular inspections and emergency preparedness measures. As a state-regulated structure, the dam continues to play a crucial role in the sustainable development of the region's water resources and environmental sustainability efforts.
Year Completed |
1974 |
Dam Length |
11900 |
Dam Height |
110 |
River Or Stream |
Schoharie Creek |
Primary Dam Type |
Earth |
Surface Area |
355 |
Drainage Area |
0.6 |
Nid Storage |
18500 |
Structural Height |
170 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
170 |
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.
Blenheim - Gilboa Upper