Auxiliary Dam No 2 Reservoir Report

Last Updated: December 5, 2025

Auxiliary Dam No 2, also known as Upper Dam, is a crucial water supply structure located in Magazine, Arkansas.


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Summary

Built in 1966, this earth dam stands at a height of 32.5 feet and has a storage capacity of 315 acre-feet. It serves the primary purpose of water supply and is regulated by the Arkansas Natural Resources Commission (ANRC). With a drainage area of 0.7 square miles and a maximum discharge of 970 cubic feet per second, this dam plays a key role in managing water resources in the region.

Situated along the Petit Jean River in Logan County, Arkansas, Auxiliary Dam No 2 has a surface area of 18 acres and a normal storage capacity of 168 acre-feet. Despite being rated with a high hazard potential, its condition assessment is currently listed as "Not Rated". The dam has not been modified in recent years and lacks detailed emergency action plans. With a history of state permitting, inspection, and enforcement, this dam remains a critical infrastructure for water management in the area. Enthusiasts of water resources and climate will find Auxiliary Dam No 2 to be an intriguing structure that plays a vital role in the local water supply system.

Year Completed

1966

Dam Length

415

Dam Height

32.5

River Or Stream

PETIT JEAN RIVER-TR

Primary Dam Type

Earth

Surface Area

18

Drainage Area

0.7

Nid Storage

315

Hazard Potential

High

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.