Gant Creek Watershed Site D-6 Reservoir Report
Last Updated: December 14, 2025
Gant Creek Watershed Site D-6 is a vital water resource located in Sioux City, Iowa, serving multiple purposes including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
Built in 1967 by USDA NRCS, this earth dam stands at a height of 30 feet with a length of 388 feet, providing a storage capacity of 482 acre-feet and covering a surface area of 3.1 acres. Situated along the TR-Big Sioux River, this low hazard potential dam is regulated by the Iowa Department of Natural Resources and is frequently inspected for safety and compliance.
With a drainage area of 0.24 square miles, Gant Creek Watershed Site D-6 plays a crucial role in managing water flow and reducing flood risks in the region. Despite its moderate risk assessment rating, the dam's condition is currently not rated, highlighting the need for further evaluation and maintenance to ensure its long-term effectiveness. As a locally-owned infrastructure, this site underscores the importance of community-based water resource management and collaboration with state regulatory agencies to safeguard against potential hazards and uphold environmental sustainability in the area.
As water resource and climate enthusiasts continue to monitor and assess the impact of climate change on water systems, the significance of maintaining and enhancing structures like Gant Creek Watershed Site D-6 becomes increasingly evident. By investing in regular inspections, risk assessments, and maintenance measures, communities can mitigate potential risks, protect vital water resources, and adapt to changing environmental conditions. Gant Creek Watershed Site D-6 serves as a prime example of the intersection between water resource management, climate resilience, and community stewardship in ensuring the sustainability and safety of our water infrastructure.
Year Completed |
1967 |
Dam Length |
388 |
Dam Height |
30 |
River Or Stream |
TR-BIG SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Drainage Area |
0.24 |
Nid Storage |
482 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Sioux River At Akron
|
816cfs |
Perry Creek Near Milnerville
|
25cfs |
Vermillion River Nr Vermillion Sd
|
33cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
13700cfs |
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 D-6
State Highway 3 Plymouth County