Scs-Mill Creek Site-11 Reservoir Report
Last Updated: December 19, 2025
SCS-Mill Creek Site-11, located in Mill Creek, Johnston County, Oklahoma, is a state-regulated earth dam designed by the USDA NRCS with a primary purpose of flood risk reduction.
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Summary
Completed in 1969, this structure stands at a height of 22 feet and has a hydraulic height of 18 feet, providing a maximum storage capacity of 304 acre-feet. The dam, spanning 800 feet in length, features a controlled spillway and a single valve outlet gate.
Despite being categorized as having a low hazard potential, the risk assessment for SCS-Mill Creek Site-11 indicates a very high risk level, necessitating ongoing management measures. The dam, under the jurisdiction of the Oklahoma Water Resources Board, is subject to state permitting, inspection, and enforcement. While the last inspection took place in 1980 and the condition assessment remains unrated, the structure continues to serve as a critical component in mitigating flood risks along the Mill Creek tributary.
This site, within the purview of the Fort Worth District of the USACE, is a key asset in water resource management within the region. With its strategic location and design parameters, SCS-Mill Creek Site-11 plays a vital role in safeguarding communities downstream and ensuring the resilience of the local ecosystem in the face of changing climatic conditions.
Year Completed |
1969 |
Dam Length |
800 |
Dam Height |
22 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
18 |
Nid Storage |
304 |
Structural Height |
22 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
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-Mill Creek Site-11