Piney Creek Watershed Structure Y-38-21 Dam Reservoir Report

Last Updated: December 11, 2025

The Piney Creek Watershed Structure Y-38-21 Dam, also known as Millis Lake, is a local government-owned dam located in Renshaw, Mississippi.


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Summary

Designed by USDA NRCS and completed in 1959, this earth dam serves the primary purpose of flood risk reduction along the TR-Piney Creek river or stream. With a height of 32 feet and a storage capacity of 578 acre-feet, the dam is regulated by the Mississippi Department of Environmental Quality and is subject to state permitting, inspection, and enforcement.

Despite its low hazard potential and moderate risk assessment, the condition of the Piney Creek Watershed Structure Y-38-21 Dam is currently not rated. The dam features an uncontrolled spillway and outlet gates, with associated structures and modifications unspecified. Emergency action plans and inundation maps are not yet prepared, highlighting the need for further risk management measures. As a significant component of water resource infrastructure in Yazoo County, Mississippi, this dam plays a crucial role in safeguarding the local community against potential flood events.

Year Completed

1959

Dam Height

32

River Or Stream

TR- PINEY CREEK

Primary Dam Type

Earth

Drainage Area

1.41

Nid Storage

578

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

32
       
Seasonal Comparison

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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.