Oak-Middle 66-A Reservoir Report

Last Updated: December 12, 2025

Oak-Middle 66-A is a local government-owned earth dam in Nebraska, designed by the USDA NRCS and regulated by the NE DNR.


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Summary

This dam, completed in 1983, stands at a height of 30 feet and serves primarily for flood risk reduction purposes. With a storage capacity of 428 acre-feet and a drainage area of 1.6 square miles, Oak-Middle 66-A plays a vital role in managing water flow and reducing the risk of flooding in the area.

Located in Butler County, Nebraska, near the TR-OAK CREEK, Oak-Middle 66-A has a low hazard potential and is currently in satisfactory condition as per the last inspection conducted in March 2016. The dam has a structural height of 30 feet and a hydraulic height of 28 feet, with a maximum discharge capacity of 467 cubic feet per second. Despite its simple design of stone core and soil foundation, Oak-Middle 66-A has proven to be effective in mitigating flood risks and protecting the surrounding community.

With its strategic location and significant contribution to flood risk reduction, Oak-Middle 66-A stands as a key infrastructure managed by the local government in partnership with federal agencies like the USDA NRCS. As climate change impacts continue to pose challenges to water resources management, dams like Oak-Middle 66-A play a crucial role in safeguarding communities and ecosystems against the increasing threats of extreme weather events and flooding.

Year Completed

1983

Dam Length

763

Dam Height

30

River Or Stream

TR-OAK CREEK

Primary Dam Type

Earth

Surface Area

16

Hydraulic Height

28

Drainage Area

1.6

Nid Storage

428

Structural Height

30

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
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.