Lake Mokoma Reservoir Report

Last Updated: December 8, 2025

Lake Mokoma, located in Laporte Borough, Sullivan County, Pennsylvania, is a private recreational lake regulated by the Pennsylvania Department of Environmental Protection.


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Summary

Built in 1890, this earth dam stands at a height of 16 feet and spans 500 feet, creating a reservoir with a storage capacity of 1,422 acre-feet. With a surface area of 110 acres and a drainage area of 3.2 square miles, Lake Mokoma serves as a popular destination for water enthusiasts seeking outdoor recreational activities.

Despite its historical significance and recreational appeal, Lake Mokoma faces challenges in terms of dam safety and maintenance. The dam has a high hazard potential and is currently assessed to be in poor condition, with the most recent inspection conducted in December 2020. In 2005, structural modifications were made to address safety concerns, highlighting the ongoing efforts to ensure the integrity of the dam and the safety of the surrounding community. As climate change continues to impact water resources, the management and maintenance of Lake Mokoma will be crucial in preserving this natural and recreational asset for future generations.

As water resource and climate enthusiasts, it is important to recognize the significance of Lake Mokoma not only as a recreational hub but also as a vital component of the local ecosystem. By staying informed about the dam's condition, regulatory oversight, and risk assessment measures, enthusiasts can contribute to the preservation and sustainable management of this water resource. Additionally, advocacy for continued investment in dam safety and maintenance will be essential in mitigating potential risks and ensuring the long-term resilience of Lake Mokoma in the face of evolving climate challenges.

Years Modified

2005 - Structural

Year Completed

1890

Dam Length

500

Dam Height

16

River Or Stream

MILL CREEK

Primary Dam Type

Earth

Surface Area

110

Drainage Area

3.2

Nid Storage

1422

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

16
       
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.