Grassi-Corini-Grandolf Dam Reservoir Report

Last Updated: December 6, 2025

Grassi-Corini-Grandolf Dam, also known as Deans Pond, is a privately owned dam located in Whitney Point, New York.


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Summary

Built in 1973, this earth dam stands at a height of 15 feet and stretches 100 feet in length, with a storage capacity of 518 acre-feet. The primary purpose of the dam is for recreation, providing a surface area of 37 acres for activities such as fishing and boating. It is regulated by the New York State Department of Environmental Conservation, ensuring that it is inspected, permitted, and enforced to meet state standards.

Situated on TR-Merrill Creek, the Grassi-Corini-Grandolf Dam plays a crucial role in managing water resources and mitigating flood risks in the area. With a low hazard potential and a moderate risk assessment rating, the dam is deemed to be in satisfactory condition, although it has not been officially rated. The spillway, with a width of 6 feet, is uncontrolled, allowing for controlled discharge of water during periods of high flow. While the dam has not been modified in recent years, it remains a key structure for maintaining water levels and protecting downstream areas.

Despite its modest size and limited associated structures, the Grassi-Corini-Grandolf Dam serves as an important recreational and safety feature in Cortland County, New York. With a history of providing water storage and flood control since its completion nearly five decades ago, this dam continues to be a valuable asset for water resource management and climate resilience in the region.

Year Completed

1973

Dam Length

100

Dam Height

15

River Or Stream

TR-MERRILL CREEK

Primary Dam Type

Earth

Surface Area

37

Drainage Area

0.85

Nid Storage

518

Hazard Potential

Low

Nid Height

15
       
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.