Whan Farms Dam Reservoir Report
Last Updated: December 9, 2025
Located in Lewis, Missouri, the Whan Farms Dam was completed in 2004 by the USDA NRCS for grade stabilization purposes along the TR-MIDDLE FABIUS river.
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Summary
This private earth dam stands at 32 feet in height, with a maximum storage capacity of 71.3 acre-feet and a normal storage of 38.9 acre-feet. The dam spans 400 feet in length and covers a surface area of 22 acres, serving as a crucial structure for managing water resources in the area.
With an uncontrolled spillway and outlet gates, the Whan Farms Dam has a low hazard potential and is considered to be in moderate risk according to the data. It is not state-regulated or inspected, making it a unique and independently managed water resource. Despite its lack of state oversight, the dam plays a vital role in the local ecosystem, providing drainage and flood control for a drainage area of 390 acres. For water resource and climate enthusiasts, the Whan Farms Dam represents a fascinating case of private ownership and management of a key infrastructure in the conservation of natural resources.
Year Completed |
2004 |
Dam Length |
400 |
Dam Height |
28 |
River Or Stream |
TR-MIDDLE FABIUS |
Primary Dam Type |
Earth |
Surface Area |
22 |
Hydraulic Height |
26 |
Drainage Area |
390 |
Nid Storage |
71.3 |
Structural Height |
32 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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.
Whan Farms Dam