Winter Lake Dam Reservoir Report
Last Updated: December 22, 2025
Winter Lake Dam, located in Robertsville, Missouri, is a privately owned structure built in 1969 for recreational purposes.
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Summary
The dam, primarily made of earth and stone, stands at a height of 40 feet and spans a length of 520 feet, with a storage capacity of 337 acre-feet. Situated on the tributary of the Bourbeuse River, the dam serves as a crucial water resource for the region, with a drainage area of 750 acres and a maximum discharge capacity of 1,761 cubic feet per second.
Despite its satisfactory condition assessment in 2007, Winter Lake Dam has been classified with a high hazard potential due to its location and structural characteristics. Regular inspections by the DAM AND RESERVOIR SAFETY PROG of Missouri ensure its continued safety and operational integrity. With a moderate risk level, the dam requires ongoing risk management measures to mitigate potential hazards and protect the surrounding community. Winter Lake Dam's uncontrolled spillway system and absence of outlet gates highlight the importance of effective emergency preparedness and response protocols.
Water resource and climate enthusiasts are drawn to Winter Lake Dam not only for its recreational amenities but also for its role in providing essential water storage and management in the Franklin County region of Missouri. As a centrally located structure with a significant storage capacity, the dam plays a vital role in regulating water flow, supporting wildlife habitats, and ensuring water availability for various uses. Ongoing monitoring and risk assessment efforts contribute to the continued safety and sustainability of Winter Lake Dam, making it a key feature in the local water resource and climate landscape.
Year Completed |
1969 |
Dam Length |
520 |
Dam Height |
40 |
River Or Stream |
TRIB-BOURBEUSE RIVER |
Primary Dam Type |
Earth |
Surface Area |
21 |
Drainage Area |
750 |
Nid Storage |
337 |
Structural Height |
40 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bourbeuse River At Union
|
71cfs |
Meramec River At Pacific
|
547cfs |
Big River At Byrnesville
|
174cfs |
Bonhomme Creek Near Ellisville
|
0cfs |
Meramec River Near Eureka
|
858cfs |
Kiefer Creek Near Ballwin
|
1cfs |
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.
Winter Lake Dam