Little Sebago Lake Reservoir Report

Last Updated: December 14, 2025

Little Sebago Lake in Maine is a private water resource that has been regulated by the state for flood risk reduction, recreation, and other purposes.


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Summary

The dam, completed in 1890, stands at 15 feet in height and holds a maximum storage capacity of 10,181 acre-feet. The lake covers an area of 1,898 acres and drains an area of 17 square miles, with a fair condition assessment and significant hazard potential.

With a hydraulic height of 11 feet and a structural height of 15 feet, Little Sebago Lake's dam plays a crucial role in managing water levels and ensuring the safety of surrounding areas. The lake's proximity to Ditch Brook and its connection to the New England District highlight its importance in the region's water management system. The dam is inspected every 6 years, with the last assessment conducted in April 2016, to maintain its integrity and address any potential risks.

As a beloved recreational spot for water and climate enthusiasts, Little Sebago Lake offers opportunities for boating, fishing, and enjoying the natural beauty of Cumberland, Maine. Its historic dam continues to serve as a vital component of the local ecosystem, providing flood protection and supporting a diverse range of wildlife. The lake's fair condition and state-regulated status underscore the need for ongoing monitoring and maintenance to preserve this valuable resource for future generations.

Year Completed

1890

Dam Length

134

Dam Height

15

River Or Stream

Ditch Brook

Primary Dam Type

Earth

Surface Area

1898

Hydraulic Height

11

Drainage Area

17

Nid Storage

10181

Structural Height

15

Hazard Potential

Significant

Nid Height

15
       
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.