West Fork Big Cr Wtrshd Site B-39 Reservoir Report
Last Updated: December 11, 2025
West Fork Big Creek Watershed Site B-39 is a low hazard potential earth dam located in Iowa, specifically in Decatur County.
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Summary
Completed in 2003, this dam serves the primary purpose of flood risk reduction along the TR-West Fork Big Creek. Managed by the Iowa Department of Natural Resources and designed by the USDA NRCS, this site spans 488 feet in length and stands at a height of 26 feet, with a maximum storage capacity of 90 acre-feet.
With a drainage area of 0.28 square miles and a surface area of 4.5 acres, this dam plays a crucial role in managing water flow and mitigating flood risks in the region. Despite being uncontrolled, the spillway of this dam is designed to handle potential overflow events. The risk assessment for this site is moderate, indicating a level of 3 out of 5 in terms of potential hazards. While the condition of the dam is currently not rated, regular inspections and enforcement measures are in place to ensure its structural integrity and effectiveness in flood risk reduction efforts.
Year Completed |
2003 |
Dam Length |
488 |
Dam Height |
26 |
River Or Stream |
TR- WEST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.5 |
Drainage Area |
0.28 |
Nid Storage |
90 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
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 Cr Wtrshd Site B-39