Big Coon Subwatershed Site 6h-2 Reservoir Report

Last Updated: December 14, 2025

Big Coon Subwatershed Site 6h-2, located in Woodbury County, Iowa, is a vital water resource managed by the local government and designed by USDA NRCS for flood risk reduction.


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Summary

Completed in 1999, this earth dam stands at a height of 33 feet and spans a length of 430 feet, with a storage capacity of 78 acre-feet. Situated along the TR- BIG CREEK, this structure plays a crucial role in fire protection, stock, and small fish pond management, in addition to its primary purpose of flood risk reduction.

With a low hazard potential and a moderate risk assessment rating, Big Coon Subwatershed Site 6h-2 is a key component in the water management infrastructure of the region. While the condition assessment is not rated and there are no specific risk management measures in place, the dam is regulated, inspected, and enforced by the Iowa DNR. Its location in Anthon, Iowa, highlights its strategic importance in safeguarding the surrounding area from potential flooding events. Water resource and climate enthusiasts would find this site fascinating for its design, purpose, and impact on local water management efforts.

Year Completed

1999

Dam Length

430

Dam Height

33

River Or Stream

TR- BIG CREEK

Primary Dam Type

Earth

Surface Area

4.8

Drainage Area

0.36

Nid Storage

78

Hazard Potential

Low

Foundations

Soil

Nid Height

33
       
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.