Jeannette (Mountain Valley Lake) Reservoir Report

Last Updated: December 5, 2025

Jeannette (Mountain Valley Lake) is a private water resource nestled in the picturesque Hempfield Township of Westmoreland, Pennsylvania.


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Summary

This earth dam, completed in 1889, stands at a height of 36 feet and spans 480 feet in length, providing a serene setting for recreational activities. The lake has a storage capacity of 300 acre-feet, with a normal storage level of 230 acre-feet and a surface area of 9 acres, making it an ideal spot for water and climate enthusiasts to explore.

Managed by the Pennsylvania Department of Environmental Protection, Jeannette (Mountain Valley Lake) is regulated and inspected regularly to ensure its safety and functionality. With a significant hazard potential and a fair condition assessment, the dam poses a moderate risk that is mitigated through risk management measures. The lake's spillway, with a width of 8 feet, is uncontrolled, adding to the natural beauty and charm of this recreational reservoir. Its waters are sourced from TR BRUSH CREEK and offer opportunities for outdoor activities in a tranquil environment.

The dam at Jeannette (Mountain Valley Lake) has undergone modifications in 2007 to enhance its hydraulic and structural integrity. With a designated inspection frequency and emergency action plan readiness, the dam is well-prepared to handle any potential risks. The picturesque location, combined with the recreational opportunities it offers, makes Jeannette a must-visit destination for water resource and climate enthusiasts seeking a peaceful retreat in the heart of Pennsylvania's beautiful countryside.

Years Modified

2007 - Hydraulic, 2007 - Structural

Year Completed

1889

Dam Length

480

Dam Height

36

River Or Stream

TR BRUSH CREEK

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.34

Nid Storage

300

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

36
       
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.