South Fork Blackwater F-1 Reservoir Report
Last Updated: December 20, 2025
South Fork Blackwater F-1 is a dam located in Holden, Missouri, designed by the USDA NRCS and completed in 1980.
°F
°F
mph
Wind
%
Humidity
Summary
This earth dam stands at a height of 48 feet and has a length of 780 feet, providing flood risk reduction for the surrounding area along the TR-Briar Creek. With a storage capacity of 165 acre-feet and a drainage area of 2714 square miles, the dam plays a crucial role in managing water resources in Johnson County.
The dam's spillway type is uncontrolled with a width of 95 feet, and it is equipped with valve outlet gates. Despite its significant hazard potential, the dam's condition assessment in 2007 deemed it satisfactory. The last inspection in 2015 indicated a regular inspection frequency of every three years. With its role in flood risk reduction and its location in an area prone to moderate risk, South Fork Blackwater F-1 serves as a vital infrastructure for water resource management and climate resilience in Missouri.
Overall, South Fork Blackwater F-1 is a key component of the local government's efforts to regulate and manage water resources in Johnson County. With its design by the USDA NRCS and its state-regulated status, the dam provides critical flood risk reduction for the area while also facing moderate risk factors that necessitate regular inspections and maintenance. As water resource and climate enthusiasts, understanding the infrastructure and function of dams like South Fork Blackwater F-1 is essential for appreciating the role they play in maintaining a sustainable and resilient environment.
Year Completed |
1980 |
Dam Length |
780 |
Dam Height |
48 |
River Or Stream |
TR-BRIAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
25 |
Drainage Area |
2714 |
Nid Storage |
165 |
Structural Height |
48 |
Outlet Gates |
Valve |
Hazard Potential |
Significant |
Foundations |
Rock |
Nid Height |
48 |
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 F-1