Evans Dam Reservoir Report
Last Updated: December 19, 2025
Evans Dam, located in Maywood, Missouri, along the TR-Middle Fabius River, was completed in 2002 by the USDA NRCS.
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Summary
This private earth dam stands at a height of 30 feet with a structural height of 32 feet and a length of 550 feet. The dam serves multiple purposes including fire protection, stock, and small fish pond management, with a storage capacity of 19 acre-feet and a surface area of 7 acres.
Despite its low hazard potential and moderate risk assessment, Evans Dam does not fall under state regulation or enforcement, making it solely under private ownership. The dam's uncontrolled spillway and outlet gates add to its unique design, contributing to its function in maintaining water resources for the surrounding area. With a drainage area of 262.4 square miles, Evans Dam plays a crucial role in managing water flow and storage in the region.
Although the dam's condition assessment is not rated and its emergency action plan status is unknown, Evans Dam remains a key structure in water resource management in Lewis County, Missouri. Its construction by the Natural Resources Conservation Service reflects a commitment to sustainable water management practices, ensuring the safety and functionality of the dam for fire protection and agricultural needs in the area. As climate change impacts water resources, the role of dams like Evans Dam becomes increasingly vital in maintaining water security and resilience in the face of changing weather patterns.
Year Completed |
2002 |
Dam Length |
550 |
Dam Height |
30 |
River Or Stream |
TR-MIDDLE FABIUS RIVER |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
28 |
Drainage Area |
262.4 |
Nid Storage |
19 |
Structural Height |
32 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
15cfs |
Wyaconda River Above Canton
|
13cfs |
Bear Creek Near Marcelline
|
5cfs |
Bear Creek At Hannibal
|
2cfs |
Salt River Near Center
|
63cfs |
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.
Evans Dam