Gant Creek Watershed Site C-6 Reservoir Report
Last Updated: December 14, 2025
Gant Creek Watershed Site C-6 is a crucial water resource located in Plymouth County, Iowa, near the city of Sioux City.
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Summary
Owned by the local government and regulated by the Iowa Department of Natural Resources, this site serves multiple purposes including fire protection, stock, and small fish pond, as well as flood risk reduction. The dam at this site, completed in 1974, is an earth structure with a height of 52 feet and a length of 720 feet, providing a storage capacity of 217 acre-feet and covering an area of 8.2 acres.
With a low hazard potential and a moderate risk assessment rating, Gant Creek Watershed Site C-6 is an important asset for the community in terms of water resource management and environmental conservation. The dam at this site plays a key role in flood risk reduction and provides valuable storage for fire protection and livestock watering. The location along the TR-Big Sioux River adds to the significance of this site in the larger watershed management plan for the region.
Despite not having a condition assessment rating, Gant Creek Watershed Site C-6 remains a well-maintained and functional infrastructure for water management in the area. With its controlled spillway and state-regulated operations, this site demonstrates a commitment to ensuring the safety and sustainability of the watershed. As climate change continues to impact water resources, sites like Gant Creek Watershed Site C-6 play a vital role in adapting to these challenges and maintaining the balance of water supply and demand in the region.
Year Completed |
1974 |
Dam Length |
720 |
Dam Height |
52 |
River Or Stream |
TR-BIG SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
8.2 |
Drainage Area |
1.21 |
Nid Storage |
217 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
52 |
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 C-6
220th Street Plymouth County