Sexton Lake Dam Reservoir Report
Nearby: Kallstrom Lake Dam Hall Lake Dam
Last Updated: December 13, 2025
Sexton Lake Dam, located in Johnson County, Missouri, is a private-owned structure primarily used for irrigation purposes.
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Summary
Built in 1968, this earth dam stands at a height of 48 feet and has a length of 569 feet, providing a storage capacity of 838 acre-feet. The dam is situated on TR-Coperas Creek and covers a surface area of 39 acres, serving as a vital water resource for the surrounding area.
With a high hazard potential, Sexton Lake Dam is under the regulatory oversight of the Missouri Dam and Reservoir Safety Program. Despite its age, the dam's condition was assessed as satisfactory as of August 2010, with regular inspections conducted every five years to ensure structural integrity and safety. The spillway, classified as uncontrolled, has a width of 17 feet to manage maximum discharge events efficiently.
Water and climate enthusiasts intrigued by the intersection of infrastructure and environmental conservation will find Sexton Lake Dam an intriguing case study. The dam's role in supporting irrigation and recreational activities, along with its risk management measures and emergency preparedness protocols, highlight the importance of sustainable water resource management in mitigating potential hazards and ensuring community safety in the face of changing climate conditions.
Year Completed |
1968 |
Dam Length |
569 |
Dam Height |
48 |
River Or Stream |
TR-COPERAS CREEK |
Primary Dam Type |
Earth |
Surface Area |
39 |
Drainage Area |
200 |
Nid Storage |
838 |
Structural Height |
46 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
48 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Creek Near Blairstown
|
9cfs |
South Grand River At Urich
|
12cfs |
Blackwater River At Blue Lick
|
45cfs |
Lamine River Near Otterville
|
16cfs |
Missouri River At Waverly
|
27800cfs |
South Grand River At Archie
|
16cfs |
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.
Sexton Lake Dam