Gallup Subwatershed 1-1200 Reservoir Report
Last Updated: December 13, 2025
Gallup Subwatershed 1-1200 in Monona, Iowa, is a locally owned earth dam constructed in 1954 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
This dam has a height of 33 feet and a storage capacity of 26 acre-feet, serving as a valuable asset for flood risk reduction in the area. The dam is located on the TR-Little Sioux River and is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place to ensure its proper maintenance and operation.
Despite being assessed as having a low hazard potential and not currently rated for its condition, Gallup Subwatershed 1-1200 presents a moderate risk level with the potential for improvement in risk management measures. With a drainage area of 0.12 square miles and a surface area of 1 acre, this dam plays a role in water resource management and climate resilience efforts in the region. While there are no associated structures or locks, the uncontrolled spillway and soil foundation of the dam contribute to its overall function and performance.
As water resource and climate enthusiasts, understanding the importance of structures like the Gallup Subwatershed 1-1200 is crucial for sustainable development and natural resource conservation. By prioritizing proper maintenance, regular inspections, and effective risk management strategies, this dam can continue to serve its intended purposes while also contributing to the overall health and resilience of the local watershed and ecosystem.
Year Completed |
1954 |
Dam Height |
33 |
River Or Stream |
TR- LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.12 |
Nid Storage |
26 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 1-1200