Holbrook Pond Dam Reservoir Report

Last Updated: December 6, 2025

Holbrook Pond Dam, located in Hebron, Connecticut, is a state-owned concrete structure that was completed in 1920 for the primary purpose of recreation.


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Summary

With a height of 9 feet and a length of 350 feet, the dam has a storage capacity of 348 acre-feet, providing a surface area of 72.5 acres for outdoor activities. The dam regulates the flow of the Jeremy River Tributary and has a maximum discharge capacity of 890 cubic feet per second.

Despite being classified as having a significant hazard potential, Holbrook Pond Dam is in satisfactory condition as of the last inspection in June 2008. The dam is regulated, permitted, and inspected by the Connecticut Department of Energy and Environmental Protection (DEEP), emphasizing the state's commitment to ensuring the safety and functionality of this vital water resource infrastructure. With its picturesque location and recreational benefits, Holbrook Pond Dam serves as a valuable asset for both water resource management and climate enthusiasts to appreciate and enjoy in the Tolland County area.

Year Completed

1920

Dam Length

350

Dam Height

9

River Or Stream

JEREMY RIVER TRIB

Primary Dam Type

Concrete

Surface Area

72.5

Drainage Area

1.84

Nid Storage

348

Hazard Potential

Significant

Nid Height

9
       
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.