Rex Eagan Gss 4 Reservoir Report

Last Updated: December 6, 2025

Rex Eagan Gss 4 is a privately owned earth dam located in Butler, Oklahoma, designed by the USDA NRCS and completed in 2000.


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Summary

It serves the primary purpose of flood risk reduction along Barnitz Creek, with a height of 24.6 feet and a length of 400 feet. The dam has a storage capacity of 105.46 acre-feet and a drainage area of 712 acres, with a controlled spillway width of 1 foot to manage maximum discharge of 30.8 cubic feet per second.

Despite being classified as having a low hazard potential and not yet rated for condition assessment, Rex Eagan Gss 4 poses a very high risk due to its location and structural characteristics. The dam has not been modified since its completion, and the last inspection in 2011 recommended a 5-year inspection frequency. While the dam is regulated by the Oklahoma Water Resources Board and meets state permitting, inspection, and enforcement requirements, there are no federal agency involvements in its ownership, funding, construction, or operation.

For water resource and climate enthusiasts, the fascinating features of Rex Eagan Gss 4 offer insights into dam engineering and flood risk reduction strategies. With its earth construction, stone core, and soil foundation, this dam exemplifies the importance of proper design and maintenance in managing water resources and mitigating natural disasters. As climate change continues to impact precipitation patterns and intensify flooding events, structures like Rex Eagan Gss 4 play a crucial role in safeguarding communities and ecosystems against the growing threats of extreme weather events.

Year Completed

2000

Dam Length

400

Dam Height

24.6

River Or Stream

BARNITZ CREEK

Primary Dam Type

Earth

Surface Area

12.57

Drainage Area

712

Nid Storage

105.46

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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.