Grindstone-Lost-Muddy Watershed Dam A-39 Reservoir Report
Last Updated: December 5, 2025
Located in DeKalb County, Missouri, the Grindstone-Lost-Muddy Watershed Dam A-39 is a vital structure owned by the local government and designed by USDA NRCS to address grade stabilization along the TR-GRINDSTONE CREEK.
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Summary
Completed in 1969, this earth dam with a stone core stands at a height of 31 feet and has a storage capacity of 213 acre-feet, serving a drainage area of 83.2 square miles.
With a spillway width of 40 feet and a high hazard potential, the dam poses a significant risk in the event of a failure. Although it has not been rated for its current condition, the dam remains a key component in managing water resources in the area. Despite lacking state jurisdiction, regulation, or permitting, the Grindstone-Lost-Muddy Watershed Dam A-39 plays a crucial role in stabilizing the surrounding landscape and protecting the local community from potential flooding events.
Given its moderate risk assessment and the absence of recent inspections, there is a pressing need for updated evaluations and emergency preparedness measures to ensure the safety and functionality of the dam. As water resource and climate enthusiasts, understanding the significance of structures like Dam A-39 is essential in safeguarding our environment and communities against the challenges posed by changing weather patterns and increasing water demands.
Year Completed |
1969 |
Dam Length |
800 |
Dam Height |
31 |
River Or Stream |
TR-GRINDSTONE CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
31 |
Drainage Area |
83.2 |
Nid Storage |
213 |
Structural Height |
31 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
31 |
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.
Grindstone-Lost-Muddy Watershed Dam A-39