Gant Creek Watershed Site D-1 Reservoir Report

Last Updated: December 14, 2025

Located in the heart of the Gant Creek Watershed in Sioux City, Iowa, Site D-1 is a vital water resource managed by the local government with oversight from the Iowa Department of Natural Resources.


°F

°F

mph

Wind

%

Humidity

Summary

This Earth dam, constructed in 1967 by the USDA NRCS, serves a variety of purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a dam height of 26 feet and a storage capacity of 25 acre-feet, this site plays a crucial role in water management and conservation efforts in the region.

Despite its low hazard potential and moderate risk assessment rating, Site D-1 has not been rated for its condition assessment. However, its primary purpose and well-maintained infrastructure make it a valuable asset for the community. With a drainage area of 0.14 square miles and a storage capacity of 25 acre-feet, this site provides essential water storage and flood protection services for the surrounding area. Its strategic location along the TR-Big Sioux River further enhances its significance in regional water resource management.

As a key component of the Gant Creek Watershed, Site D-1 offers a glimpse into the intricate network of water management systems in the region. With its strategic design, purposeful construction, and ongoing regulatory oversight, this site stands as a testament to the importance of sustainable water resource management in mitigating flood risks, supporting local ecosystems, and ensuring water security for future generations.

Year Completed

1967

Dam Height

26

River Or Stream

TR- BIG SIOUX RIVER

Primary Dam Type

Earth

Surface Area

2

Drainage Area

0.14

Nid Storage

25

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
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.