Gant Creek Watershed Site A-7 Reservoir Report
Last Updated: December 14, 2025
Located in Sioux City, Iowa, Gant Creek Watershed Site A-7 is a local government-owned dam designed by USDA NRCS with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Completed in 1969, this earth dam stands at a height of 37 feet and spans a length of 526 feet, with a storage capacity of 94 acre-feet and a surface area of 5.4 acres. Situated on the TR-Big Sioux River, this dam is regulated by the Iowa DNR and is used for flood risk reduction in addition to its primary purposes.
With a low hazard potential and a moderate risk assessment rating, Gant Creek Watershed Site A-7 is an essential infrastructure for water resource management in Plymouth County, Iowa. Despite not having a condition assessment rating, this dam serves as a crucial component of the local ecosystem and contributes to the overall resilience of the region. While there are no associated structures or outlet gates, the dam's presence plays a vital role in maintaining water quality and providing essential services to the surrounding community.
As water resource and climate enthusiasts, the significance of Gant Creek Watershed Site A-7 lies in its multifaceted purpose and its contribution to both water management and environmental protection efforts. With the potential for future modifications or enhancements to further improve its functionality, this dam stands as a testament to the importance of sustainable water infrastructure in the face of changing climate conditions. As stewards of our water resources, it is imperative to continue monitoring and maintaining structures like Gant Creek Watershed Site A-7 to ensure the long-term safety and well-being of our communities.
Year Completed |
1969 |
Dam Length |
526 |
Dam Height |
37 |
River Or Stream |
TR-BIG SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
5.4 |
Drainage Area |
0.45 |
Nid Storage |
94 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Sioux River At Akron
|
816cfs |
Perry Creek Near Milnerville
|
25cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
13700cfs |
Vermillion River Nr Vermillion Sd
|
33cfs |
Omaha Cr At Homer
|
45cfs |
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.
Gant Creek Watershed Site A-7
220th Street Plymouth County