Lloydell Reservoir Report

Last Updated: December 5, 2025

Lloydell, a gravity dam completed in 1906, is located in Adams Township, Cambria County, Pennsylvania.


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Summary

This dam primarily serves as a water supply structure for the surrounding area, with a storage capacity of 719 acre-feet and a normal storage level of 635 acre-feet. Situated on the South Fork Little Conemaugh River, Lloydell has a height of 43 feet and a length of 700 feet, making it a significant feature in the region's water resource management.

Managed by the Pennsylvania Department of Environmental Protection, Lloydell is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and functionality. Despite being classified as having a high hazard potential, the dam's condition assessment is deemed fair as of the last inspection in September 2020. With a surface area of 42 acres and serving a drainage area of 8 square miles, Lloydell plays a crucial role in water supply and flood control in the region, highlighting the importance of proper maintenance and monitoring for climate and water resource enthusiasts.

As a key infrastructure in the Baltimore District overseen by the Pennsylvania state agency, Lloydell's significance extends beyond its structural attributes. It stands as a testament to the intersection of water resource management, climate resilience, and regulatory oversight in safeguarding communities against the risks associated with dam failures. The dam's history, purpose, and operational parameters make it a compelling subject for those interested in the intricate relationship between water resources and climate adaptation strategies, showcasing the ongoing efforts to balance water supply needs with safety and environmental considerations in the face of changing climate patterns.

Year Completed

1906

Dam Length

700

Dam Height

43

River Or Stream

S FORK LITTLE CONEMAUGH RIVER

Primary Dam Type

Gravity

Surface Area

42

Drainage Area

8

Nid Storage

719

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

43
       
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.