Mack&Woodard Lake Dam-Sect 22 Reservoir Report
Last Updated: December 19, 2025
Mack&Woodard Lake Dam-Sect 22, located in Grundy, Missouri, is a private earth dam primarily used for recreation purposes.
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Summary
With a height of 20 feet and a storage capacity of 107 acre-feet, this dam poses a high hazard potential. Despite being in a non-regulated state jurisdiction, it is essential to monitor and assess the condition of this dam regularly to ensure the safety of surrounding communities and the sustainability of water resources.
Situated on the TR-Thompson River, this dam is owned privately and has not been modified or inspected recently. The lack of a condition assessment raises concerns about its structural integrity and emergency preparedness. Given its high hazard potential, it is crucial for the owners to develop an Emergency Action Plan (EAP) and update their emergency contacts and inundation maps to meet safety guidelines and mitigate risks associated with potential dam failures.
Water resource and climate enthusiasts should take note of Mack&Woodard Lake Dam-Sect 22 as an integral component of the local watershed system. Understanding its purpose, storage capacity, and risk assessment can help in effective water management and emergency response planning. By prioritizing regular inspections and compliance with safety guidelines, stakeholders can ensure the long-term resilience of this dam and safeguard the community from potential hazards.
Dam Height |
20 |
River Or Stream |
TR-THOMPSON RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Drainage Area |
70 |
Nid Storage |
107 |
Structural Height |
20 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Thompson River At Trenton
|
111cfs |
Medicine Creek Near Laredo
|
6cfs |
Grand River At Chillicothe
|
361cfs |
Grand River Near Gallatin
|
61cfs |
Locust Creek Near Linneus
|
35cfs |
Shoal Creek Near Braymer Mo
|
12cfs |
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.
Mack&Woodard Lake Dam-Sect 22