Upper Locust Creek R- 9 Reservoir Report
Last Updated: December 12, 2025
Upper Locust Creek R-9, also known as Site R-9, is a flood risk reduction structure located in Unionville, Missouri.
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Summary
Designed by USDA NRCS, this earth dam stands at a height of 29.3 feet and was completed in 2010. With a primary purpose of flood risk reduction, the dam has a storage capacity of 121.9 acre-feet and serves a drainage area of 285 square miles.
Situated on TR-Rooks Branch, Upper Locust Creek R-9 has a low hazard potential and is currently rated as "Not Rated" for condition assessment. The dam features an uncontrolled spillway with a width of 40 feet and a maximum discharge capacity of 248.6 cubic feet per second. Despite not being regulated by the state or requiring inspections, the dam plays a crucial role in managing flood risks in the area.
Although lacking an Emergency Action Plan and inundation maps, Upper Locust Creek R-9 is deemed to have a moderate risk level. With no outlet gates and no associated structures, the dam remains a key asset for flood control in Sullivan County. As water resource and climate enthusiasts, this structure offers a fascinating case study in flood risk reduction and dam management practices.
Year Completed |
2010 |
Dam Length |
530 |
Dam Height |
29.3 |
River Or Stream |
TR-ROOKS BRANCH |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
29 |
Drainage Area |
285 |
Nid Storage |
121.9 |
Structural Height |
38 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
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.
Upper Locust Creek R- 9