Johnson Dam Reservoir Report
Nearby: Fawn Lake Dam Nehai Tonkayea Lake Dam
Last Updated: December 19, 2025
Johnson Dam, located in Chariton, Missouri, is a private Grade Stabilization structure designed by the USDA NRCS and completed in 2005.
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Summary
The dam is primarily used for Grade Stabilization purposes and is categorized as an Earth dam with a Stone core and Soil foundation. With a height of 29 feet and a length of 482 feet, the dam has a storage capacity of 25.7 acre-feet and serves a drainage area of 330 acres.
The dam's spillway is uncontrolled with a width of 10 feet, and it has a low hazard potential and a moderate risk assessment rating. Although the dam has not been rated for its condition, it has not undergone any recent inspections or maintenance. Despite being privately owned, Johnson Dam operates without any state jurisdiction, regulation, permitting, or inspection. The dam's location on the TR-Cottonwood stream under the Rock Island District of the USACE adds an interesting dimension to its management and operation.
Overall, Johnson Dam stands as a testament to the collaboration between private owners and federal agencies in managing water resources for Grade Stabilization purposes. Its design and construction by the NRCS showcase a commitment to sustainable water management practices in the region. As climate change continues to impact water resources, structures like Johnson Dam play a vital role in maintaining the ecological balance and protecting communities from potential flood risks.
Year Completed |
2005 |
Dam Length |
482 |
Dam Height |
29 |
River Or Stream |
TR-COTTONWOOD |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
27 |
Drainage Area |
330 |
Nid Storage |
25.7 |
Structural Height |
33 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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.
Johnson Dam