Deweys Mills Reservoir Report

Last Updated: December 13, 2025

Deweys Mills, located in Hartford, Vermont, is a hydroelectric dam situated on the Ottauquechee River.


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Summary

Built in 1900, this concrete dam stands at a height of 25 feet with a length of 395 feet, providing a storage capacity of 1000 acre-feet. The dam serves as a vital structure for harnessing hydropower in the region, with a primary purpose of hydroelectric generation.

Despite its age, Deweys Mills has a low hazard potential and its condition is currently rated as "Not Rated". The dam is under federal ownership and jurisdiction, with no state regulation or permitting required. The New England District of the US Army Corps of Engineers oversees the operations and maintenance of the dam, ensuring its safe and efficient functioning in generating clean energy for the surrounding community.

Although Deweys Mills has not been inspected since May 2000, it remains a key player in the renewable energy landscape of Vermont. With its historical significance and contribution to sustainable power generation, Deweys Mills stands as a testament to the enduring importance of water resources and climate-conscious infrastructure in the region.

Year Completed

1900

Dam Length

395

Dam Height

25

River Or Stream

OTTAUQUECHEE RIVER

Primary Dam Type

Concrete

Surface Area

56

Hydraulic Height

25

Drainage Area

207

Nid Storage

1000

Structural Height

25

Hazard Potential

Low

Foundations

Rock

Nid Height

25
       
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.