Lake Madeleine Reservoir Report

Last Updated: December 14, 2025

Lake Madeleine, located in Bennington, Vermont, is a private hydroelectric reservoir with a dam constructed in 1957 by Haley & Aldrich.


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Summary

The dam, primarily made of earth and stone, stands at a height of 65 feet and spans a length of 1700 feet, creating a reservoir with a storage capacity of 873 acre-feet. The lake covers a surface area of 35 acres and is fed by Hopper Brook, serving as a vital water resource in the region.

Despite its age, Lake Madeleine's dam is assessed to be in fair condition, with a significant hazard potential. The last inspection in 1978 revealed no major issues, and the dam is currently not regulated by the state. However, the owner is responsible for its maintenance and upkeep as it continues to provide hydroelectric power in the area. The reservoir's scenic location and historical significance make it a valuable asset for both water resource and climate enthusiasts to explore and appreciate.

As an important piece of Vermont's hydroelectric infrastructure, Lake Madeleine offers a glimpse into the region's renewable energy efforts and water management practices. With its picturesque setting and functional purpose, the reservoir serves as a reminder of the intersection between human innovation and environmental stewardship. For those interested in water resources and climate resilience, Lake Madeleine presents a unique opportunity to study the impact of hydroelectric power on local ecosystems and communities, making it a compelling destination for exploration and research.

Year Completed

1957

Dam Length

1700

Dam Height

65

River Or Stream

HOPPER BROOK

Primary Dam Type

Earth

Surface Area

35

Hydraulic Height

65

Drainage Area

0.53

Nid Storage

873

Structural Height

70

Hazard Potential

Significant

Foundations

Soil

Nid Height

70
       
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.