Don Nail Reservoir Report
Last Updated: December 12, 2025
Don Nail is a private earth dam located in Napoleon, Missouri, along the TR-FISHING R.
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Summary
river. Constructed in 1996 by the USDA NRCS, this grade stabilization structure stands at a height of 36 feet and spans 228 feet in length. With a normal storage capacity of 18 acre-feet and a drainage area of 128 square miles, Don Nail serves to mitigate erosion and protect the surrounding land from sediment runoff.
Despite its low hazard potential, Don Nail plays a crucial role in managing water flow and maintaining the ecological balance of the area. With a moderate risk assessment rating of 3, this earth dam provides a vital function in regulating the flow of the TR-FISHING R. river. The structure's uncontrolled spillway, measuring 60 feet in width, ensures that excess water can safely be discharged during periods of high flow, reducing the risk of downstream flooding.
While not currently rated for condition assessment, Don Nail remains a key piece of infrastructure for the region. With its primary purpose being grade stabilization, this privately owned dam continues to support the local ecosystem and water resources. As a water resource and climate enthusiast, Don Nail's significance lies in its role in preserving the natural environment and safeguarding against the impacts of erosion and sedimentation.
Year Completed |
1996 |
Dam Length |
228 |
Dam Height |
33 |
River Or Stream |
TR-FISHING R. |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
32 |
Drainage Area |
128 |
Nid Storage |
69 |
Structural Height |
36 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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.
Don Nail