Big Coon Subwatershed Site D-2-1 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbury County, Iowa, the Big Coon Subwatershed Site D-2-1 is a crucial water resource managed by the local government for fire protection, stock, and small fish pond purposes.
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Summary
This earth dam, constructed in 1999 by the USDA NRCS, stands at a height of 42 feet and has a storage capacity of 59 acre-feet. Situated on the TR- Little Sioux River, this site plays a key role in flood risk reduction for the surrounding area.
With a drainage area of 0.28 square miles and a surface area of 4 acres, the Big Coon Subwatershed Site D-2-1 has a low hazard potential and a moderate risk assessment rating. While the dam is currently in good condition and has not been rated for its maintenance needs, it is subject to state regulation, inspection, and enforcement by the Iowa DNR. Its primary purpose, along with flood risk reduction, is to ensure water availability for fire protection and livestock use in the region.
As a part of the larger water management system in the region, this site serves as a vital resource for both environmental conservation and community safety. With its strategic location and design by the Natural Resources Conservation Service, the Big Coon Subwatershed Site D-2-1 stands as a testament to the commitment to sustainable water resource management in Woodbury County, Iowa.
Year Completed |
1999 |
Dam Length |
390 |
Dam Height |
42 |
River Or Stream |
TR- LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.28 |
Nid Storage |
59 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
42 |
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 |
Missouri River At Sioux City
|
13700cfs |
Little Sioux River Near Turin
|
1040cfs |
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 D-2-1