West Fork Big Creek Watershed Site S-10 Reservoir Report
Last Updated: December 11, 2025
West Fork Big Creek Watershed Site S-10 in Iowa is a key water resource managed by local government authorities and designed by the USDA NRCS.
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Summary
This site, located in Decatur County, serves multiple purposes including fire protection, stock, small fish pond maintenance, and flood risk reduction. The earth dam, completed in 1996, stands at a height of 22 feet and has a storage capacity of 106 acre-feet, with a normal storage level of 26 acre-feet and a drainage area of 0.35 square miles.
The dam's spillway is uncontrolled and the hazard potential is rated as low, with a moderate risk assessment score of 3. Despite being in good condition and not rated for assessment, the dam lacks an Emergency Action Plan (EAP) and inundation maps for potential emergency situations. The site's location in the West Fork Big Creek Watershed and its management by the Iowa DNR make it a crucial point of interest for water resource and climate enthusiasts, highlighting the importance of effective monitoring, maintenance, and emergency preparedness for such critical infrastructure.
Year Completed |
1996 |
Dam Length |
505 |
Dam Height |
22 |
River Or Stream |
TR- SHAIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.6 |
Drainage Area |
0.35 |
Nid Storage |
106 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
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.
West Fork Big Creek Watershed Site S-10