Ozark Lock And Dam Reservoir Report

Last Updated: December 5, 2025

Ozark Lock and Dam, also known as Ozark Lake, is a federal-owned structure located in Dardanelle, Arkansas.


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Summary

Completed in 1969 by the US Army Corps of Engineers, this concrete gravity dam serves primarily for navigation purposes on the Arkansas River. With a dam height of 42 feet and a hydraulic height of 33 feet, this multi-arch dam spans 2,500 feet in length and has a storage capacity of 148,400 acre-feet.

While offering hydroelectric power generation, recreational opportunities, and navigation support, Ozark Lock and Dam also presents significant flood risk potential, as indicated by a very high risk assessment rating. The US Army Corps of Engineers actively manages these risks by implementing monitoring and maintenance measures, engaging with local emergency managers, and continually updating emergency action plans to ensure the safety and structural integrity of the dam. With a spillway width of 750 feet and one lock measuring 600 feet in length and 110 feet in width, Ozark Lock and Dam remains a critical infrastructure for water resource management in the region, supported by the dedicated efforts of the USACE.

Year Completed

1969

Dam Length

2500

Dam Height

42

River Or Stream

ARKANSAS

Primary Dam Type

Concrete

Surface Area

10600

Length Of Locks

600

Hydraulic Height

33

Drainage Area

151800

Nid Storage

148400

Structural Height

100

Hazard Potential

Significant

Foundations

Rock

Nid Height

100
       
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.