Delano Island Reservoir Report

Last Updated: December 5, 2025

Delano Island, located in Jefferson County, New York, is a captivating site for water resource and climate enthusiasts.


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Summary

This hydroelectric dam, completed in 1924, serves multiple purposes including hydroelectric power generation and water supply management. With a dam height of 12 feet and a length of 200 feet, it harnesses the power of the Black River to store up to 2000 acre-feet of water, covering a surface area of 190 acres.

Managed by the Federal Energy Regulatory Commission, the dam boasts a low hazard potential and a moderate risk assessment, making it a reliable and essential piece of infrastructure in the region. The dam's uncontrolled spillway, with a width of 191 feet, ensures the safe release of excess water during high flow events. Although the condition assessment is not currently available, regular inspections by FERC help to maintain the dam's structural integrity and operational efficiency.

Delano Island is not just a concrete structure in the Black River; it represents a harmonious blend of human ingenuity and natural resource management. Its historical significance, combined with its modern-day functionality, makes it a must-visit destination for those interested in sustainable water resource practices and the intersection of climate and infrastructure.

Year Completed

1924

Dam Length

200

Dam Height

12

River Or Stream

Black River

Primary Dam Type

Concrete

Surface Area

190

Drainage Area

1874

Nid Storage

2000

Hazard Potential

Low

Foundations

Rock

Nid Height

12
       
Seasonal Comparison

Weather Forecast

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.