Webb Reservoir Report
Nearby: N/A Ruth Gss No 1
Last Updated: December 6, 2025
Webb, located in Tishomingo, Johnston County, Oklahoma, is a private earth dam designed by the USDA NRCS and completed in 1965.
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Summary
This dam on TR-Pennington Creek has a height of 25 feet and a hydraulic height of 20 feet, with a storage capacity of 66 acre-feet. The dam serves a primary purpose of "Other" and has a spillway width of 1 foot, controlled by a single valve outlet gate.
Despite being assessed as having a low hazard potential and not yet rated for condition assessment, Webb poses a very high risk due to its location and design. The dam has not been modified in recent years and is subject to a five-year inspection frequency. The state-regulated structure falls under the jurisdiction of the Oklahoma Water Resources Board and is in the Fort Worth District of the US Army Corps of Engineers. With its unique design and critical role in water management, Webb is a noteworthy site for water resource and climate enthusiasts to study and monitor closely.
Year Completed |
1965 |
Dam Length |
800 |
Dam Height |
25 |
River Or Stream |
TR-PENNINGTON CR |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
20 |
Nid Storage |
66 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pennington Creek Near Reagan
|
7cfs |
Blue River Near Connerville
|
54cfs |
Washita River Near Dickson
|
317cfs |
Rock Creek At Sulphur
|
8cfs |
Clear Boggy Creek Near Caney
|
423cfs |
Blue River Near Blue
|
58cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Webb