Rex Hill Dam No 5 Reservoir Report
Last Updated: December 17, 2025
Rex Hill Dam No 5, located in Harrison County, Missouri, serves the primary purpose of grade stabilization along the Little Rock Creek.
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Summary
This private earth dam, with a height of 23 feet and a length of 440 feet, was completed in 1991 and has a storage capacity of 96 acre-feet. The dam also features an uncontrolled spillway with a width of 10 feet and a maximum discharge of 78 cubic feet per second.
Despite being rated as having a low hazard potential, Rex Hill Dam No 5 is considered to have a moderate risk level. The dam's condition is currently not rated, and it has not been inspected in recent years. While it does not fall under state jurisdiction for regulation, permitting, inspection, or enforcement, the dam plays a vital role in managing water resources and maintaining the stability of the surrounding area.
For water resource and climate enthusiasts, Rex Hill Dam No 5 presents an intriguing case study in dam infrastructure management. With its unique design features and purpose, this private dam serves as a critical component in the local ecosystem. As efforts to address climate change and water resource management continue to evolve, understanding the role of structures like Rex Hill Dam No 5 becomes increasingly important in ensuring the resilience and sustainability of our water systems.
Year Completed |
1991 |
Dam Length |
440 |
Dam Height |
23 |
River Or Stream |
TR-LITTLE ROCK CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
23 |
Drainage Area |
32 |
Nid Storage |
96 |
Structural Height |
23 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
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.
Rex Hill Dam No 5