Big Coon Subwatershed Site 2-9a Reservoir Report
Last Updated: December 14, 2025
Big Coon Subwatershed Site 2-9a, located in Woodbury County, Iowa, is a vital water resource managed by the USDA NRCS.
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Summary
This earth dam, completed in 1999, serves multiple purposes including fire protection, stock watering, and flood risk reduction. With a dam height of 45 feet and a storage capacity of 128 acre-feet, this structure plays a crucial role in managing water levels in the TR-Big Creek watershed.
Despite being classified as having a low hazard potential, the dam at Big Coon Subwatershed Site 2-9a is subject to regular state inspection and enforcement to ensure its safety and effectiveness. The risk assessment for this site indicates a moderate level of risk, with moderate risk management measures in place. The nearby city of Anthon benefits from the water management capabilities of this site, which helps protect against potential flooding and supports local agriculture and wildlife.
Overall, Big Coon Subwatershed Site 2-9a stands as a testament to the importance of sustainable water resource management in the face of climate change. With its multiple functions and careful oversight, this site plays a crucial role in safeguarding the local community and ecosystem while contributing to the broader efforts to address water challenges in Iowa.
Year Completed |
1999 |
Dam Length |
543 |
Dam Height |
45 |
River Or Stream |
TR- BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.6 |
Nid Storage |
128 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Floyd River At James
|
187cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
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.
Big Coon Subwatershed Site 2-9a