Mitchell Sludge Sedimentation Pond Reservoir Report

Last Updated: December 5, 2025

The Mitchell Sludge Sedimentation Pond, located in Union Township, Pennsylvania, is a privately owned earth dam structure designed for sedimentation purposes along the Monongahela River.


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Summary

Completed in 1982, this 50-foot high dam has a storage capacity of 16 acre-feet and covers a surface area of 0.5 acres. With a drainage area of 0.11 square miles, the pond plays a crucial role in managing sedimentation and water quality in the region.

Managed by the Pennsylvania Department of Environmental Protection, the Mitchell Sludge Sedimentation Pond is considered to have a significant hazard potential, although its condition assessment is deemed satisfactory. Regular inspections are conducted to ensure its structural integrity and operational effectiveness, with the last inspection taking place in November 2017. Despite its private ownership, the dam is regulated and permitted by the state, reflecting a commitment to environmental protection and water resource management.

As a key component of the water infrastructure in Washington County, Pennsylvania, the Mitchell Sludge Sedimentation Pond serves as a vital resource for sediment control and water quality improvement in the region. With its strategic location along the Monongahela River, the dam plays a crucial role in managing sedimentation, highlighting the importance of proactive maintenance and regulatory oversight to ensure its continued effectiveness in safeguarding water resources and mitigating environmental impacts.

Year Completed

1982

Dam Length

165

Dam Height

50

River Or Stream

TR MONONGAHELA RIVER

Primary Dam Type

Earth

Surface Area

0.5

Drainage Area

0.11

Nid Storage

16

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

50
       
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.