Wylie Reservoir Report

Last Updated: December 5, 2025

Wylie, located in Fort Mill, South Carolina, is a hydroelectric dam operated by the Catawba River.


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Summary

Built in 1925 by the Wateree Power Company, this gravity dam stands at a height of 119 feet and spans 3,232 feet in length. With a storage capacity of 246,435 acre-feet and a surface area of 12,177 acres, Wylie serves multiple purposes including hydroelectric power generation, recreation, and water supply for the region.

Managed by the Federal Energy Regulatory Commission, Wylie poses a high hazard potential and is classified as very high risk due to its critical infrastructure and location. The dam features controlled spillways and 11 slide gates for water release. While the condition assessment is not available, regular inspections and emergency action plans are in place to ensure the safety and integrity of the structure. With a maximum discharge of 386,364 cubic feet per second, Wylie plays a crucial role in managing water resources and supporting the surrounding communities.

As a key component of the water management system in South Carolina, Wylie remains a vital asset for the region's water supply, energy generation, and recreational activities. With its historic significance and ongoing regulatory oversight, Wylie continues to be a focal point for water resource and climate enthusiasts interested in sustainable infrastructure and environmental stewardship.

Year Completed

1925

Dam Length

3232

Dam Height

119

River Or Stream

Catawba

Primary Dam Type

Gravity

Surface Area

12177

Drainage Area

3020

Nid Storage

246435

Structural Height

119

Outlet Gates

Slide (sluice gate) - 11

Hazard Potential

High

Foundations

Rock

Nid Height

119
       
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.