Stump Pond Reservoir Report

Last Updated: December 21, 2025

Stump Pond, located in Penobscot, Maine, is a privately owned reservoir on Cambolasse Stream that serves multiple purposes, including hydroelectric power generation and recreation.


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Summary

The concrete dam, completed in 1936, stands at a height of 12 feet and spans 350 feet in length, with a storage capacity of 1089 acre-feet and a normal storage level of 792 acre-feet. The reservoir covers a surface area of 160 acres and has a drainage area of 17 square miles, making it a significant water resource in the region.

Despite its low hazard potential, Stump Pond is regulated by the Maine Emergency Management Agency and undergoes regular inspections for safety and compliance. While the condition assessment is currently rated as "Not Rated," the dam's emergency action plan status and risk management measures are unspecified. With its picturesque setting and diverse functions, including providing clean energy and recreational opportunities, Stump Pond serves as a vital water resource in the area, highlighting the importance of sustainable water management practices amidst changing climate conditions. For water resource and climate enthusiasts, Stump Pond offers a fascinating study in the intersection of human infrastructure and natural ecosystems.

Year Completed

1936

Dam Length

350

Dam Height

12

River Or Stream

Cambolasse Stream

Primary Dam Type

Concrete

Surface Area

160

Drainage Area

17

Nid Storage

1089

Structural Height

12

Hazard Potential

Low

Nid Height

12
       
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.