Gant Creek Watershed Site A-5 Reservoir Report

Last Updated: December 14, 2025

Gant Creek Watershed Site A-5, located in Sioux City, Iowa, is a vital water resource managed by the local government and regulated by the Iowa Department of Natural Resources.


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Summary

This site, designed by USDA NRCS, serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. The earth dam, constructed in 1969, stands at a height of 58 feet and has a storage capacity of 146 acre-feet.

With a low hazard potential and a moderate risk assessment rating, Gant Creek Watershed Site A-5 plays a crucial role in water management and conservation efforts in the region. The dam's condition is currently not rated, and there is no emergency action plan in place. However, the site undergoes state inspections and enforcement to ensure its operational efficiency and safety standards. The surrounding area, with a drainage area of 1.32 square miles, benefits from the water storage and flood control provided by this structure along the TR-Big Sioux River.

Year Completed

1969

Dam Length

1106

Dam Height

58

River Or Stream

TR-BIG SIOUX RIVER

Primary Dam Type

Earth

Surface Area

6

Drainage Area

1.32

Nid Storage

146

Hazard Potential

Low

Foundations

Soil

Nid Height

58
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.