Windy Knoll Dam Reservoir Report
Nearby: Lake Scheffborg Dam Hunt Lake Dam
Last Updated: December 18, 2025
Windy Knoll Dam, located in Marthasville, Missouri, was completed in 1969 and serves as a recreational area along the Trib-Charrette Creek.
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Summary
The earth dam stands at 31 feet in height and spans 432 feet in length, with a storage capacity of 83 acre-feet. Despite its primary purpose for recreation, the dam is classified as having a high hazard potential.
The dam, owned privately, is not regulated by the state nor does it receive federal funding or oversight. Its last inspection dates back to June 1980, with a condition assessment of "Not Rated". While the dam lacks certain safety measures such as an Emergency Action Plan (EAP) and inundation maps, it remains a popular spot for outdoor enthusiasts in Warren County, Missouri.
With its serene setting and ample recreational opportunities, Windy Knoll Dam stands as a local landmark in the Marthasville area. However, the lack of recent inspections and safety measures raises concerns about its resilience in the face of potential hazards. For water resource and climate enthusiasts, this dam serves as a reminder of the importance of regular maintenance and proactive risk management in safeguarding our natural resources.
Year Completed |
1969 |
Dam Length |
432 |
Dam Height |
31 |
River Or Stream |
TRIB-CHARRETTE CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
45 |
Nid Storage |
83 |
Structural Height |
31 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cuivre River Near Troy
|
42cfs |
Dardenne Creek At Ofallon
|
14cfs |
Missouri River At Hermann
|
28400cfs |
Dardenne Creek At Old Town St. Peters
|
8cfs |
Bourbeuse River At Union
|
71cfs |
Bonhomme Creek Near Ellisville
|
0cfs |
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.
Windy Knoll Dam