Jim Merrigan Structure Dam Reservoir Report
Last Updated: December 17, 2025
The Jim Merrigan Structure Dam in Missouri, completed in 1973, serves the primary purpose of grade stabilization along the TR-WHITE CLOUD CREEK.
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Summary
This privately owned earth dam stands at a height of 20 feet with a hydraulic height of 19 feet and a structural height of 21 feet. With a maximum storage capacity of 123 acre-feet and normal storage of 73 acre-feet, the dam covers a surface area of 6 acres and drains a watershed area of 166.4 square miles.
The dam's spillway, with a width of 50 feet, is uncontrolled, and it has a low hazard potential with a moderate risk assessment rating of 3. The condition assessment is marked as "Not Rated," indicating a need for further evaluation. While the dam currently does not have any outlet gates or associated structures, it plays a crucial role in stabilizing the surrounding area and managing water flow along the creek. The location of the dam in Gentry, Missouri, underlines its significance in the local water resource management system.
Despite not being regulated by the state or federal agencies, the Jim Merrigan Structure Dam remains an essential infrastructure for maintaining water resources and mitigating potential risks in the region. With its design focused on grade stabilization and its strategic location within the watershed, this dam serves as a key element in the overall climate resilience efforts in the area. As water resource and climate enthusiasts, understanding the role and condition of structures like the Jim Merrigan Dam is vital for promoting sustainable water management practices and ensuring the safety and security of communities in the face of changing environmental conditions.
Year Completed |
1973 |
Dam Length |
600 |
Dam Height |
20 |
River Or Stream |
TR-WHITE CLOUD CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
19 |
Drainage Area |
166.4 |
Nid Storage |
123 |
Structural Height |
21 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
21 |
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.
Jim Merrigan Structure Dam