Groveville Reservoir Report

Last Updated: December 6, 2025

Groveville, also known as Glenham Dam, is a private hydroelectric dam located in Dutchess County, New York.


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Summary

Constructed in 1875, this gravity dam stands at 37.3 feet tall with a hydraulic height of 51.8 feet and a structural height of 44.3 feet. The dam has a storage capacity of 43 acre-feet and serves multiple purposes including fire protection, stock, small fish pond, and hydroelectric power generation.

Managed by the Federal Energy Regulatory Commission (FERC), Groveville plays a crucial role in controlling the flow of Fishkill Creek and has a maximum discharge capacity of 19,960 cubic feet per second. The dam's spillway, which is uncontrolled, has a width of 140 feet. Despite its high hazard potential, the condition assessment of Groveville is currently not available, but it undergoes regular inspections with the last one conducted in September 2020. The risk assessment for the dam is rated as moderate, highlighting the importance of ongoing monitoring and management measures to ensure its safety and functionality.

With its historical significance and vital role in water resource management and renewable energy generation, Groveville stands as a testament to the enduring impact of infrastructure projects on local ecosystems and communities. As an integral part of the hydrological system in Dutchess County, this dam serves as a reminder of the delicate balance between harnessing natural resources for human benefit and protecting the environment for future generations. Enthusiasts of water resources and climate change will find Groveville to be a fascinating case study in the intersection of engineering, ecology, and sustainability.

Year Completed

1875

Dam Length

296

Dam Height

37.3

River Or Stream

Fishkill Creek

Primary Dam Type

Gravity

Surface Area

2

Hydraulic Height

51.8

Drainage Area

189

Nid Storage

43

Structural Height

44.3

Hazard Potential

High

Foundations

Rock

Nid Height

52
       
Seasonal Comparison

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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.