Francis Mashburn Dam Reservoir Report
Last Updated: December 17, 2025
Francis Mashburn Dam, located in Harrison County, Missouri, is a privately owned structure designed by the USDA NRCS for grade stabilization along the TR-Long Branch river.
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Summary
Completed in 2003, this earth dam stands at 30 feet tall and spans 380 feet in length, with a storage capacity of 31 acre-feet. The dam serves the primary purpose of grade stabilization and is classified as a low hazard potential structure with a moderate risk assessment rating.
Although not regulated by the state of Missouri, Francis Mashburn Dam plays a crucial role in managing water resources in the area, providing flood control and ensuring the stability of the surrounding ecosystem. The dam's uncontrolled spillway, with a width of 10 feet, helps manage excess water flow during heavy rainfall events. Despite its relatively small surface area of 5 acres, the dam covers a drainage area of 185.6 square miles, showcasing its importance in water management efforts.
With no outlet gates and a lack of state inspections or enforcement, the condition assessment of Francis Mashburn Dam remains unrated. However, the structure's design and construction by the Natural Resources Conservation Service demonstrate a commitment to sustainable water resource management. Although not under the jurisdiction of state regulatory agencies, the dam's role in grade stabilization and flood control highlights its significance in maintaining water quality and ecosystem health in the region.
Year Completed |
2003 |
Dam Length |
380 |
Dam Height |
29 |
River Or Stream |
TR-LONG BRANCH |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
29 |
Drainage Area |
185.6 |
Nid Storage |
31 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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.
Francis Mashburn Dam