Scs Mill Creek Site-18 Reservoir Report
Last Updated: December 19, 2025
SCS Mill Creek Site-18, located in Mill Creek, Johnston County, Oklahoma, is a state-regulated dam designed by the USDA NRCS with a primary purpose of flood risk reduction.
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Summary
Completed in 1969, this earth dam stands at a height of 31 feet and has a hydraulic height of 25 feet, with a storage capacity of 376.9 acre-feet and a drainage area of 1.09 square miles. The dam, situated on Three Mile Creek, is part of the flood control infrastructure overseen by the Oklahoma Water Resources Board.
With a hazard potential rated as high and a condition assessment of fair, SCS Mill Creek Site-18 is considered to be at very high risk, emphasizing the importance of regular inspections and maintenance. The dam features a controlled spillway and a single valve outlet gate. Despite its age, this dam plays a crucial role in managing floodwaters and protecting downstream areas from inundation. The site's risk management measures, emergency action plan, and inundation maps are key components in ensuring the safety and integrity of this vital water resource infrastructure.
Year Completed |
1969 |
Dam Length |
1100 |
Dam Height |
31 |
River Or Stream |
THREE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
11.3 |
Hydraulic Height |
25 |
Drainage Area |
1.09 |
Nid Storage |
376.9 |
Structural Height |
29 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pennington Creek Near Reagan
|
57cfs |
Rock Creek At Sulphur
|
8cfs |
Blue River Near Connerville
|
49cfs |
Washita River Near Dickson
|
319cfs |
Washita River Near Pauls Valley
|
327cfs |
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.
Cold Springs - Chickasaw National Rec Area
Bukhorn Campground Loop A
Goddard Youth Camp
Buckhorn Campground Loop B
Central Campground
Buckhorn - Chickasaw National Rec Area
Scs Mill Creek Site-18