Scs-Pennington Creek Site-1 Reservoir Report
Last Updated: December 19, 2025
SCS-Pennington Creek Site-1, located in Johnston, Oklahoma, is a state-regulated dam designed by USDA NRCS with a primary purpose of flood risk reduction.
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Summary
Completed in 1953, this earth dam stands at a height of 39 feet with a hydraulic height of 34 feet and a length of 2080 feet. It has a storage capacity of 1280 acre-feet, with a normal storage of 372 acre-feet and a surface area of 55 acres.
Despite being classified as low hazard potential, the dam at SCS-Pennington Creek Site-1 poses a very high risk due to its condition being not rated. The last inspection was conducted in 1980, with an inspection frequency of 5 years. The dam features a controlled spillway type with a width of 2 feet and one valve as an outlet gate. Although there is no Emergency Action Plan (EAP) prepared, the dam meets State permitting, inspection, and enforcement requirements.
For water resource and climate enthusiasts, the SCS-Pennington Creek Site-1 presents an opportunity to study the management and risk assessment of a key flood risk reduction infrastructure in Oklahoma. With its unique design and historical significance, this dam serves as a crucial asset in protecting the surrounding area from potential flooding events. Further research and monitoring of this site could provide valuable insights into sustainable water resource management practices and climate adaptation strategies.
Year Completed |
1953 |
Dam Length |
2080 |
Dam Height |
39 |
River Or Stream |
PENNINGTON CREEK |
Primary Dam Type |
Earth |
Surface Area |
55 |
Hydraulic Height |
34 |
Nid Storage |
1280 |
Structural Height |
39 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rock Creek At Sulphur
|
8cfs |
Pennington Creek Near Reagan
|
57cfs |
Blue River Near Connerville
|
49cfs |
Washita River Near Dickson
|
319cfs |
Washita River Near Pauls Valley
|
327cfs |
Little River Near Sasakwa
|
9cfs |
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.
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Scs-Pennington Creek Site-1