Acme (Pa-657) Reservoir Report

Last Updated: December 5, 2025

Acme (Pa-657) is a local government-owned dam located in Mount Pleasant Township, Pennsylvania, along Jacobs Creek.


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Summary

Built in 1975 by USDA NRCS, this earth dam stands at a height of 33 feet and stretches 500 feet in length. Its primary purpose is for recreation, with additional functions including flood risk reduction. The dam has a normal storage capacity of 93 acre-feet and a maximum storage capacity of 1540 acre-feet, serving a drainage area of 2.6 square miles.

Managed by the Pennsylvania Department of Environmental Protection, Acme (Pa-657) is regulated, inspected, and enforced by state authorities. Its condition is assessed as satisfactory, but it poses a high hazard potential. While it has not been modified in recent years, it undergoes regular inspections, with the last one conducted in August 2019. Despite the lack of a formal emergency action plan, the dam meets regulatory guidelines and contributes to overall risk management measures in the area.

Acme (Pa-657) provides a vital recreational resource for the local community while also serving as a key infrastructure for flood risk reduction. With its historical significance and ongoing state oversight, this dam remains a crucial element in water resource management within Westmoreland County, Pennsylvania. Its structural integrity and operational functionality underscore the importance of continued monitoring and maintenance to ensure the safety and sustainability of the surrounding environment.

Year Completed

1975

Dam Length

500

Dam Height

33

River Or Stream

JACOBS CREEK

Primary Dam Type

Earth

Surface Area

25

Drainage Area

2.6

Nid Storage

1540

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

33
       
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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.