Webb Reservoir Report

Last Updated: December 5, 2025

Webb, located in Bryan County, Oklahoma, is a privately owned earth dam constructed in 1975 by the USDA NRCS.


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Summary

This structure, with a height of 20 feet and a length of 700 feet, serves multiple purposes and is regulated by the Oklahoma Water Resources Board. The dam has a low hazard potential and a very high risk assessment rating, indicating the importance of monitoring and maintenance to ensure its safety and functionality.

With a maximum storage capacity of 59 acre-feet and a normal storage of 53 acre-feet, Webb plays a crucial role in water resource management for the area, specifically in the Rock Creek watershed. The dam features a controlled spillway and one valve outlet gate for controlled water release. Despite being last inspected in 2004, the dam has not been rated for its current condition, highlighting the need for a thorough assessment to determine any necessary maintenance or improvements to mitigate risks associated with its aging infrastructure.

As a significant water management structure in the region, Webb's design and construction by the Natural Resources Conservation Service reflect a commitment to sustainable water resource practices. With its state-regulated status and the potential impact of its failure on downstream communities, continued monitoring and adherence to regulatory guidelines are essential to ensure the safety and integrity of this vital infrastructure in Bryan County, Oklahoma.

Year Completed

1975

Dam Length

700

Dam Height

20

River Or Stream

TR-ROCK CR

Primary Dam Type

Earth

Surface Area

19

Hydraulic Height

18

Nid Storage

59

Structural Height

20

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

20
       
Seasonal Comparison

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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.