Clifton No. 3 Reservoir Report

Last Updated: December 5, 2025

Clifton No.


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Summary

3 is a historic gravity dam located on the Pacolet River in Spartanburg, South Carolina, with a primary purpose of hydroelectric power generation. Built in 1899, this dam stands at a height of 33 feet and has a storage capacity of 250 acre-feet. Its masonry and gravity dam types, along with a buttress core type and rock foundation, contribute to its structural integrity.

Managed by the Federal Energy Regulatory Commission, Clifton No. 3 has a low hazard potential and a moderate risk assessment rating. With a spillway width of 290 feet and a maximum discharge capability of 60,000 cubic feet per second, this dam plays a crucial role in regulating water flow in the region. Despite its age, Clifton No. 3 continues to operate efficiently, providing essential hydroelectric power while maintaining a safe condition.

The surrounding area benefits from the presence of Clifton No. 3, with the dam contributing to flood control, water storage, and energy production. As a significant piece of infrastructure in the region, this dam serves as a testament to the enduring importance of water resource management and climate resilience in South Carolina.

Year Completed

1899

Dam Length

375

Dam Height

33

River Or Stream

Pacolet River

Primary Dam Type

Gravity

Surface Area

20

Hydraulic Height

28

Drainage Area

318

Nid Storage

250

Structural Height

33

Hazard Potential

Low

Foundations

Rock

Nid Height

33
       
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.