Globe Hollow Reservoir Dam Reservoir Report

Last Updated: December 6, 2025

Located in Manchester, Connecticut, the Globe Hollow Reservoir Dam stands as a vital structure for water supply purposes, completed in 1906.


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Summary

With a dam height of 40 feet and a length of 700 feet, this earth-type dam holds a storage capacity of 842 acre-feet, serving the local community with a normal storage level of 545 acre-feet. The reservoir, situated on the Hop Brook river, covers a surface area of 45 acres within a drainage area of 2.2 square miles.

Regulated by the Connecticut Department of Energy and Environmental Protection (DEEP), the Globe Hollow Reservoir Dam has been assessed to be in fair condition, with a significant hazard potential. The dam's last inspection took place in October 2019, with a scheduled inspection frequency of 5 years. The emergency action plan (EAP) status and risk assessment details are currently not available, highlighting the importance of ongoing monitoring and maintenance for this critical water resource infrastructure.

With a spillway width of 33 feet and a maximum discharge capacity of 2120 cubic feet per second, the Globe Hollow Reservoir Dam plays a crucial role in managing water flow and ensuring the safety of downstream areas. As climate change continues to impact water resources, the maintenance and upkeep of such structures become increasingly essential. Enthusiasts of water resources and climate resilience can appreciate the significance of the Globe Hollow Reservoir Dam in safeguarding the region's water supply and mitigating potential risks associated with dam infrastructure.

Year Completed

1906

Dam Length

700

Dam Height

40

River Or Stream

HOP BROOK

Primary Dam Type

Earth

Surface Area

45

Drainage Area

2.2

Nid Storage

842

Hazard Potential

Significant

Nid Height

40
       
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.