Auxiliary Dam No 1 Reservoir Report

Last Updated: December 5, 2025

Auxiliary Dam No 1, also known as Lower Dam, is a critical water supply infrastructure located in Magazine, Arkansas.


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Summary

Completed in 1934, this Rockfill dam stands at a height of 34.2 feet and has a storage capacity of 125 acre-feet, with a normal storage level of 66 acre-feet. Situated on the Petit Jean River, this dam plays a vital role in providing water for the surrounding area, covering a drainage area of 1.1 square miles. Despite its importance, the dam has a high hazard potential and is currently rated as 'Not Rated' in terms of condition assessment.

Managed by the state regulatory agency ANRC, Auxiliary Dam No 1 undergoes regular inspections and enforcement to ensure its structural integrity and safety. The dam has a maximum discharge capacity of 4360 cubic feet per second and serves as a crucial water supply source for the region. With a surface area of 21 acres and a length of 418 feet, this dam is a key component in the water resource management system of Logan County, Arkansas. Its location in the heart of the state underscores its significance in maintaining a reliable water supply for the community.

Year Completed

1934

Dam Length

418

Dam Height

34.2

River Or Stream

PETIT JEAN RIVER-TR

Primary Dam Type

Rockfill

Surface Area

21

Hydraulic Height

34.2

Drainage Area

1.1

Nid Storage

125

Hazard Potential

High

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.