Greenwalt Reservoir Report

Last Updated: December 5, 2025

Greenwalt, also known as Lake Dom, is a private water resource located in Unity Township, Westmoreland, Pennsylvania.


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Summary

Managed by the Pennsylvania Department of Environmental Protection, this dam was completed in 1990 and serves primarily for recreational purposes. With a dam height of 27 feet and a length of 785 feet, Greenwalt has a storage capacity of 171 acre-feet and a normal storage level of 92 acre-feet, covering a surface area of 15 acres and draining an area of 2.2 square miles.

The dam on Crabtree Creek has a significant hazard potential, although its condition assessment is currently marked as 'Not Rated'. Despite being uninspected since February 2018, the dam has a scheduled inspection frequency of every 2 years. The surrounding area does not have an Emergency Action Plan (EAP) in place, raising concerns about the readiness for any potential emergencies. With its unique earth dam type and buttress core design, Greenwalt stands as a crucial water resource in the region, attracting water resource and climate enthusiasts alike.

For those interested in water resources and climate change, Greenwalt offers a fascinating study in dam construction and management. Its location in a scenic environment in Unity Township provides an ideal setting for recreational activities and wildlife habitat. However, the dam's significant hazard potential and lack of recent inspection raise questions about its long-term safety and management strategies. Greenwalt serves as a reminder of the importance of proper infrastructure maintenance and emergency preparedness in the face of changing environmental conditions.

Year Completed

1990

Dam Length

785

Dam Height

27

River Or Stream

CRABTREE CREEK

Primary Dam Type

Earth

Surface Area

15

Drainage Area

2.2

Nid Storage

171

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

27
       
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.