Soap Creek Watershed Site 4-99 Reservoir Report
Last Updated: December 6, 2025
Soap Creek Watershed Site 4-99, located in the beautiful county of Appanoose, 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 29 feet and spans 485 feet in length, serving the primary purpose of flood risk reduction for the local community. With a storage capacity of 129 acre-feet and covering a surface area of 5 acres, this structure plays a crucial role in managing water flow in the area.
Managed by the Iowa DNR and regulated by the state, Soap Creek Watershed Site 4-99 boasts a low hazard potential and a moderate risk assessment score. Despite not being rated for condition assessment, this structure meets state permitting and inspection requirements, ensuring its safety and effectiveness in flood control. Situated along the Tr-Mormon Creek, this site is a vital component of water resource management in the region, offering protection to the surrounding areas from potential flooding events.
With its uncontrolled spillway and soil foundation, Soap Creek Watershed Site 4-99 stands as a testament to effective water resource management in Iowa. Supported by the local government and designed to mitigate flood risks, this structure represents a harmonious balance between human development and environmental conservation. As water resource and climate enthusiasts, we can appreciate the importance of such structures in safeguarding communities and ecosystems from the impacts of extreme weather events, making Soap Creek Watershed Site 4-99 a key player in the sustainable management of water resources in the region.
Year Completed |
2004 |
Dam Length |
485 |
Dam Height |
29 |
River Or Stream |
Tr- Mormon Creek |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.45 |
Nid Storage |
129 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Honey Creek State Park Campground
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Lake Wapello State Park Campground
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Lake Wapello State Park
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Soap Creek Watershed Site 4-99
Rathbun Lake Near Rathbun
200th Avenue Appanoose County