Big Coon Subwatershed Site 3-3 Reservoir Report
Last Updated: December 14, 2025
Big Coon Subwatershed Site 3-3, located in Anthon, Iowa, is a dam site managed by the USDA NRCS with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
This earth dam, completed in 1999, stands at a height of 41 feet and spans 439 feet in length, with a storage capacity of 73 acre-feet. The dam is regulated by the Iowa DNR and is subject to state inspection, permitting, and enforcement.
With a low hazard potential and a moderate risk assessment rating, Big Coon Subwatershed Site 3-3 plays a crucial role in managing water resources in the area. The dam site is situated along the TR-Big Creek river or stream and covers a surface area of 5.1 acres, serving a drainage area of 0.34 square miles. Despite not having a spillway structure, the dam's uncontrolled spillway type allows for safe water release in times of excess flow. The site's condition is currently not rated, but it meets state regulatory standards for operation and maintenance.
Overall, Big Coon Subwatershed Site 3-3 is a vital infrastructure asset for water resource management, providing essential services for fire protection, agricultural stock, and flood risk reduction. With its strategic location and design, this dam site plays a significant role in safeguarding the local community and environment from potential water-related hazards. Climate and water resource enthusiasts will appreciate the site's importance in maintaining a balanced ecosystem and mitigating risks associated with water management in the region.
Year Completed |
1999 |
Dam Length |
439 |
Dam Height |
41 |
River Or Stream |
TR- BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.1 |
Drainage Area |
0.34 |
Nid Storage |
73 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
41 |
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 3-3