Hillman Reservoir No 2 Dam Reservoir Report

Last Updated: December 5, 2025

Hillman Reservoir No 2 Dam, located in Arkansas, serves as a critical infrastructure for flood risk reduction along the Mill Bayou-OS river stream.


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Summary

Completed in 1946, this earth dam stands at a hydraulic height of 7 feet and a structural height of 10 feet, with a length of 2700 feet. The dam has a storage capacity of 600 acre-feet, with a normal storage level of 460 acre-feet, providing essential protection against potential flooding in the surrounding area.

While the dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment, its emergency action plan and risk management measures are yet to be fully assessed and implemented. The primary purpose of Hillman Reservoir No 2 Dam is flood risk reduction, with no associated state regulation or inspection. Despite being privately owned and not falling under federal jurisdiction, the dam plays a crucial role in mitigating flood risks in the region.

As water resource and climate enthusiasts, understanding the significance of Hillman Reservoir No 2 Dam in managing flood risks along the Mill Bayou-OS is essential. With its strategic location and storage capacity, the dam continues to safeguard the surrounding communities from potential flooding events. The focus now shifts towards ensuring that emergency preparedness measures and risk management strategies are in place to further enhance the dam's resilience and effectiveness in flood risk reduction.

Year Completed

1946

Dam Length

2700

River Or Stream

MILL BAYOU-OS

Primary Dam Type

Earth

Hydraulic Height

7

Nid Storage

600

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.