Scs-Mill Creek Site-15 Reservoir Report
Last Updated: December 19, 2025
SCS-Mill Creek Site-15, located in Johnston, Oklahoma, is a state-regulated earth dam designed by the USDA NRCS in 1969 for the primary purpose of flood risk reduction along TR-Mill Creek.
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Summary
This low-hazard dam stands at 38 feet high with a storage capacity of 1172 acre-feet and a controlled spillway width of 1 foot. Although last inspected in 1980, this dam remains in a "Not Rated" condition assessment, highlighting the need for updated risk management measures.
Despite its low hazard potential, the risk assessment for SCS-Mill Creek Site-15 indicates a very high risk level, possibly due to its age and lack of recent inspections. With a drainage area unspecified, this dam serves a critical role in protecting the surrounding area from flooding events. As the state agency responsible for regulation, enforcement, and inspection, the OWRB plays a key role in ensuring the safety and functionality of this vital infrastructure.
As climate change continues to impact water resources and increase the frequency and intensity of extreme weather events, the maintenance and assessment of dams like SCS-Mill Creek Site-15 become even more crucial. With the potential for significant risk in the event of failure, it is imperative that proper risk management measures are implemented and that regular inspections are conducted to protect the community and environment downstream.
Year Completed |
1969 |
Dam Length |
1600 |
Dam Height |
38 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
21 |
Hydraulic Height |
34 |
Nid Storage |
1172 |
Structural Height |
38 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rock Creek At Sulphur
|
8cfs |
Pennington Creek Near Reagan
|
9cfs |
Washita River Near Dickson
|
317cfs |
Blue River Near Connerville
|
44cfs |
Washita River Near Pauls Valley
|
329cfs |
Clear Boggy Creek Near Caney
|
423cfs |
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-Mill Creek Site-15