Folly Pond South Reservoir Report

Last Updated: December 19, 2025

Folly Pond South, also known as Upper Folly Pond, is a crucial water supply infrastructure located in York, Maine.


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Summary

This public utility dam was completed in 1942 and stands at a height of 28 feet, with a hydraulic height of 22 feet. The dam has a storage capacity of 800 acre-feet, with a normal storage level of 768 acre-feet, covering a surface area of 70 acres. The spillway width of 142 feet ensures proper water discharge during peak periods.

Maintained and regulated by the Maine Emergency Management Agency (MEMA), Folly Pond South plays a significant role in ensuring water supply security in the region. The dam is classified as having a low hazard potential, although its condition assessment is currently not rated. Despite this, regular inspections are conducted every 12 months to monitor and evaluate the structural integrity of the dam. Emergency action plans are in place, although they have not been updated recently.

Enthusiasts interested in water resource management and climate resilience can appreciate the role of Folly Pond South in safeguarding the water supply for the community. With its strategic location and design features, this earth dam serves as a critical infrastructure for water storage and management in the region. As climate change continues to pose challenges to water resources, the proper maintenance and regulation of dams like Folly Pond South are essential for ensuring resilience and sustainability in the face of evolving environmental threats.

Year Completed

1942

Dam Length

500

Dam Height

28

River Or Stream

Watershed Area

Primary Dam Type

Earth

Surface Area

70

Hydraulic Height

22

Nid Storage

800

Hazard Potential

Low

Nid Height

28
       
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.