Gant Creek Watershed Site B-1 Reservoir Report

Last Updated: December 14, 2025

Gant Creek Watershed Site B-1, located in Plymouth County, Iowa, is a crucial water resource managed by the local government for fire protection, stock, and small fish pond purposes.


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Summary

This earth dam, completed in 1967, stands at a height of 38 feet and has a storage capacity of 46 acre-feet. With a low hazard potential and moderate risk assessment, the dam serves the community by reducing flood risks and ensuring water supply stability in the area.

Managed by the Iowa Department of Natural Resources, Gant Creek Watershed Site B-1 overlooks the TR-Big Sioux River and covers a drainage area of 0.29 square miles. With a surface area of 2.7 acres, the dam plays a vital role in regulating water flow and maintaining the ecological balance of the region. The site's design and construction were carried out by the USDA NRCS, ensuring that it meets state inspection, enforcement, and regulatory standards to guarantee its safety and functionality.

As a part of the Omaha District, Gant Creek Watershed Site B-1 exemplifies a successful collaboration between local and federal agencies in managing water resources effectively. With a focus on sustainability and risk management, this site serves as a model for integrated water resource management practices, showcasing the importance of responsible stewardship in ensuring the resilience of our water infrastructure in the face of changing climate conditions.

Year Completed

1967

Dam Length

416

Dam Height

38

River Or Stream

TR-BIG SIOUX RIVER

Primary Dam Type

Earth

Surface Area

2.7

Drainage Area

0.29

Nid Storage

46

Hazard Potential

Low

Foundations

Soil

Nid Height

38
       
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.