Persimmon Creek Structure Y-21-03 Dam Reservoir Report

Last Updated: December 5, 2025

The Persimmon Creek Structure Y-21-03 Dam, also known as the Williams Dam, is a key flood risk reduction structure located in Skuna, Mississippi.


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Summary

Owned by the local government and regulated by the Mississippi Department of Environmental Quality, this earth dam was completed in 1959 by the USDA NRCS. With a height of 21 feet and a hydraulic height of 18 feet, the dam serves to protect the surrounding area from potential flooding events, with a storage capacity of 215 acre-feet and a normal storage level of 22.3 feet.

Constructed with a stone core and a soil foundation, this dam spans a length of 530 feet and covers a surface area of 8.5 acres, with a drainage area of 0.52 square miles. Despite its uncontrolled spillway and outlet gates, the Persimmon Creek Structure Y-21-03 Dam has been assessed with a low hazard potential and a moderate risk level, indicating a need for ongoing monitoring and management. With its strategic location in the Vicksburg District and its primary purpose of flood risk reduction, this dam plays a crucial role in safeguarding the local community and environment from the impacts of extreme weather events and changing climate patterns.

Year Completed

1959

Dam Length

530

Dam Height

21

River Or Stream

UNT OF HORSEPEN CREEK

Primary Dam Type

Earth

Surface Area

8.5

Hydraulic Height

18

Drainage Area

0.52

Nid Storage

215

Structural Height

21

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

21
       
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.