Soap Creek Watershed Site 4-93 Reservoir Report

Last Updated: December 6, 2025

Soap Creek Watershed Site 4-93, located in Selma, Appanoose County, Iowa, is a flood risk reduction structure designed by the USDA NRCS and completed in 2004.


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Summary

This earth dam stands at a height of 32 feet and has a length of 373 feet, with a storage capacity of 73 acre-feet. The dam serves the primary purpose of flood risk reduction, specifically for the Tr- Soap Creek waterway, within the Rock Island District.

With a drainage area of 0.29 square miles, this low hazard potential dam has a surface area of 3.3 acres and a normal storage capacity of 19 acre-feet. Operated by the Iowa Department of Natural Resources, the site is regulated and permitted by state agencies for inspection and enforcement. The dam, categorized as uncontrolled spillway type, poses a moderate risk rating of 3 and has not been rated for its condition assessment.

Overall, Soap Creek Watershed Site 4-93 serves as a vital infrastructure for managing flood risk in the region, showcasing collaborative efforts between local government agencies and federal designers. Positioned along the Tr-Soap Creek waterway, this structure plays a crucial role in safeguarding the surrounding communities from potential flooding events, underscoring the importance of sustainable water resource management in mitigating climate-related risks in Iowa.

Year Completed

2004

Dam Length

373

Dam Height

32

River Or Stream

Tr- Soap Creek

Primary Dam Type

Earth

Surface Area

3.3

Drainage Area

0.29

Nid Storage

73

Hazard Potential

Low

Foundations

Soil

Nid Height

32
       
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.