Soap Creek Watershed Site 68-114a Reservoir Report

Last Updated: December 6, 2025

Soap Creek Watershed Site 68-114a is a local government-owned flood risk reduction structure located in Monroe, Iowa.


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Summary

Designed by USDA NRCS and completed in 2005, this earth dam stands 29 feet tall and spans 265 feet, with a storage capacity of 36 acre-feet. Situated on TR- Boyd Branch, this dam serves the primary purpose of flood risk reduction and grade stabilization in the area, covering a drainage area of 0.16 square miles.

With a low hazard potential and a moderate risk assessment rating, Soap Creek Watershed Site 68-114a plays a crucial role in mitigating potential flooding events in the region. The uncontrolled spillway and stone core foundation further enhance the dam's resilience against hydraulic pressures, ensuring the safety of nearby communities like SELMA. Despite not being state-regulated or inspected, this structure remains a vital component of the local water resource management system, reflecting the collaborative efforts between federal and local agencies in safeguarding the environment and enhancing climate resilience.

Year Completed

2005

Dam Length

265

Dam Height

29

River Or Stream

TR- BOYD BRANCH

Primary Dam Type

Earth

Surface Area

2

Drainage Area

0.16

Nid Storage

36

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
Seasonal Comparison

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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.