Gallup Subwatershed 4-3538 Reservoir Report
Last Updated: December 13, 2025
Located in Monona, Iowa, the Gallup Subwatershed 4-3538 is a key water resource managed by the local government for purposes such as fire protection, stock, and small fish pond maintenance.
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Summary
Constructed in 1954 by the USDA NRCS, this earth dam stands at a height of 28 feet and has a storage capacity of 73 acre-feet, serving the Little Sioux River tributary. While the dam is rated as having a low hazard potential, it is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement to ensure its safety and functionality.
With a drainage area of 0.41 square miles, the Gallup Subwatershed 4-3538 plays a crucial role in flood risk reduction for the surrounding area. Its spillway type is uncontrolled, and it has a moderate risk assessment score of 3. Despite its condition being listed as "Not Rated," the dam is regularly monitored to mitigate any potential risks. While the dam's primary purpose is for fire protection and stock maintenance, it also serves as a vital resource for maintaining ecological balance and preserving the local water supply.
Overall, the Gallup Subwatershed 4-3538 is an essential infrastructure managed by the local government in Iowa, contributing to various environmental and community needs. As climate and water resource enthusiasts, understanding the design, purpose, and regulatory measures in place for this dam provides valuable insight into how such structures support sustainable water management and ecosystem preservation in the region.
Year Completed |
1954 |
Dam Height |
28 |
River Or Stream |
TR- LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.41 |
Nid Storage |
73 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Little Sioux River At Correctionville
|
327cfs |
Missouri River At Decatur
|
15500cfs |
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.
Gallup Subwatershed 4-3538