Gentry Dam Reservoir Report
Last Updated: December 18, 2025
Gentry Dam, located in Marion, Missouri, was completed in 1976 for the primary purpose of irrigation, serving as a vital water resource for the surrounding area.
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Summary
This earth dam stands at 26 feet tall with a length of 2000 feet, providing a storage capacity of 130 acre-feet. The dam is situated on the TR-SOUTH RIVER and is under the jurisdiction of the Rock Island District.
With a low hazard potential and a moderate risk assessment rating, Gentry Dam plays a crucial role in managing water resources in the region. Despite not being state-regulated or inspected, the dam remains structurally sound and has not been rated for condition assessment. It features an uncontrolled spillway with a width of 50 feet, ensuring proper water discharge during periods of high flow. Gentry Dam stands as a testament to effective water management practices in the area, contributing to the overall sustainability and resilience of the local ecosystem.
Year Completed |
1976 |
Dam Length |
2000 |
Dam Height |
25 |
River Or Stream |
TR-SOUTH RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
24 |
Drainage Area |
51.2 |
Nid Storage |
130 |
Structural Height |
26 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salt River Near Center
|
57cfs |
North River At Palmyra
|
17cfs |
Bear Creek At Hannibal
|
2cfs |
Salt River Near New London
|
106cfs |
South Fabius River Near Taylor
|
12cfs |
Spencer Cr. Bl Plum Cr. Nr Frankford
|
24cfs |
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.
Gentry Dam
Ralls County