South Fork Blackwater River Dam E- 25a Reservoir Report
Last Updated: December 6, 2025
South Fork Blackwater River Dam E-25a, located in St.
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Summary
Johns Church, Missouri, is a vital structure designed by USDA NRCS for grade stabilization along Pin Oak Creek. Completed in 1982, this earth dam stands at a height of 28 feet and has a hydraulic height of 22 feet, serving its primary purpose effectively. With a storage capacity of 127.4 acre-feet and a maximum discharge of 297 cubic feet per second, this dam plays a crucial role in managing water resources in the region.
Despite its low hazard potential and moderate risk assessment, South Fork Blackwater River Dam E-25a has not been rated for its condition as of yet. The dam, made of stone core and soil foundations, spans a length of 720 feet and features an uncontrolled spillway with a width of 40 feet. Although it is not state-regulated or inspected, this structure plays a key role in flood control and water management within the area. With no associated locks or outlet gates, the dam continues to serve its purpose effectively with regular inspections.
For water resource and climate enthusiasts, South Fork Blackwater River Dam E-25a presents a fascinating case study of a local government-owned dam that contributes to grade stabilization along Pin Oak Creek. With its strategic location in Johnson County, Missouri, and its significant storage capacity, this dam showcases the importance of effective water infrastructure in managing drainage areas and maximizing water resources. Despite its age, the dam continues to play a crucial role in mitigating flood risks and enhancing water security in the region, making it a noteworthy structure for those interested in sustainable water management practices.
Year Completed |
1982 |
Dam Length |
720 |
Dam Height |
28 |
River Or Stream |
PIN OAK CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
22 |
Drainage Area |
339.2 |
Nid Storage |
277 |
Structural Height |
33 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
South Fork Blackwater River Dam E- 25a