Hydro-Kennebec Reservoir Report

Last Updated: December 19, 2025

Hydro-Kennebec is a captivating hydroelectric facility located in Waterville, Maine, along the picturesque Kennebec River.


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Summary

Constructed in 1989 by Stone & Webster Engineering Corp., this concrete gravity dam stands at a height of 35 feet and boasts a storage capacity of 3900 acre-feet. With a maximum discharge of 190,000 cubic feet per second and a controlled spillway width of 755 feet, Hydro-Kennebec plays a crucial role in fire protection, stock maintenance, small fish pond creation, hydroelectric power generation, and recreational activities in the region.

Managed by the Federal Energy Regulatory Commission, Hydro-Kennebec has a low hazard potential and a very high risk assessment rating. While the dam's condition assessment is not currently available, regular inspections are conducted to ensure its safety and functionality. The facility features three Bascule outlet gates and offers a surface area of 250 acres for various water-related activities. With its strategic location and cutting-edge design, Hydro-Kennebec continues to be a significant landmark in the water resource and climate conservation efforts in the region, showcasing the seamless integration of sustainable hydroelectric power generation and recreational opportunities.

Year Completed

1989

Dam Length

835

Dam Height

35

River Or Stream

Kennebec River

Surface Area

250

Drainage Area

4270

Nid Storage

3900

Outlet Gates

Bascule - 3

Hazard Potential

Low

Foundations

Rock

Nid Height

35
       
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.