Blenheim - Gilboa Lower Reservoir Report
Last Updated: December 7, 2025
Blenheim-Gilboa Lower is a state-owned hydroelectric dam located in North Blenheim, New York, on the Schoharie Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Designed by Chas. T. Main and completed in 1974, this earth dam stands at 100 feet tall and has a structural height of 165 feet, with a length of 1810 feet. The dam serves multiple purposes, including hydroelectric power generation and recreation, with a storage capacity of 16,330 acre-feet and a maximum discharge of 179,700 cubic feet per second.
Managed by the Federal Energy Regulatory Commission, the dam poses a high hazard potential and has a very high risk assessment rating. While it is not currently regulated by the state, it undergoes regular inspections by the federal agency to ensure its safety and stability. The dam features a controlled spillway with a width of 180 feet and three radial Tainter gates for water release. Despite its high risk level, there is no condition assessment available, and the emergency action plan status is unknown.
Overall, Blenheim-Gilboa Lower is a significant water resource structure in New York, playing a vital role in hydroelectric power generation and providing recreational opportunities. With its impressive design and storage capacity, the dam requires diligent monitoring and maintenance to mitigate its high hazard potential and ensure the safety of surrounding communities. The dam's importance in the region's water infrastructure is underscored by its federal oversight and critical role in managing water resources in the Schoharie Creek watershed.
Year Completed |
1974 |
Dam Length |
1810 |
Dam Height |
100 |
River Or Stream |
Schoharie Creek |
Primary Dam Type |
Earth |
Surface Area |
430 |
Drainage Area |
356 |
Nid Storage |
16330 |
Structural Height |
165 |
Outlet Gates |
Tainter (radial) - 3 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
165 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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 Lower