Coneross Creek Wcd Dam 9a Reservoir Report

Last Updated: December 5, 2025

Coneross Creek WCD Dam 9a, located in Oconee, South Carolina, is a significant structure designed by the USDA NRCS in 1963 for the primary purpose of flood risk reduction.


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Summary

As a locally owned earth dam standing at 34 feet tall and 705 feet long, it plays a crucial role in protecting the surrounding area from potential flooding events along the TR-COLONELS FORK CREEK.

With a storage capacity of 724 acre-feet and a surface area of 25 acres, this dam has been regulated and inspected by the South Carolina Department of Health and Environmental Control (DHEC) to ensure its structural integrity and safety. Despite being classified as having a high hazard potential, it has been assessed to be in fair condition as of April 2020, with a moderate risk level of 3. The dam's uncontrolled spillway and outlet gates, combined with its stone core and soil foundation, further highlight its importance in managing water resources and mitigating flood risks in the region.

Year Completed

1963

Dam Length

705

Dam Height

34

River Or Stream

TR-COLONELS FORK CREEK

Primary Dam Type

Earth

Surface Area

25

Nid Storage

724

Outlet Gates

Uncontrolled

Hazard Potential

High

Foundations

Soil

Nid Height

34
       
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.