Moraine State Park Reservoir Report

Last Updated: December 6, 2025

Moraine State Park, also known as Lake Arthur, is a breathtaking recreation area located in Muddy Creek Township, Butler, Pennsylvania.


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Summary

Managed by the Pennsylvania Department of Environmental Protection, this state-regulated park is a haven for water resource and climate enthusiasts. The park boasts a stunning Earth dam, standing at a height of 55 feet and stretching 1933 feet in length. Completed in 1968, the dam provides a storage capacity of 98,000 acre-feet, with a normal storage level of 38,000 acre-feet.

With a surface area of 3200 acres and a drainage area of 53 square miles, Moraine State Park offers a variety of outdoor activities such as boating, fishing, hiking, and picnicking. The park's high hazard potential is closely monitored through regular inspections, ensuring the dam's structural integrity and overall safety. Surrounded by the natural beauty of Muddy Creek and lush landscapes, Moraine State Park is a must-visit destination for those who appreciate the intersection of water resources and climate conservation. Whether you're seeking adventure or simply looking to unwind in nature, this captivating park has something for everyone to enjoy.

Year Completed

1968

Dam Length

1933

Dam Height

55

River Or Stream

MUDDY CREEK

Primary Dam Type

Earth

Surface Area

3200

Drainage Area

53

Nid Storage

98000

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

55
       
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.