Willow Creek Subwatershed Site M-2 Reservoir Report
Last Updated: December 15, 2025
Willow Creek Subwatershed Site M-2 in Woodbury County, Iowa, is a local government-owned dam designed by the USDA NRCS and regulated by the Iowa DNR.
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Summary
Completed in 1968, this earth dam stands at a height of 38 feet and has a storage capacity of 115 acre-feet, primarily serving purposes like fire protection, stock watering, and flood risk reduction. Located on TR-Wolf Creek, this dam covers a surface area of 7.2 acres within a drainage area of 0.77 square miles.
With a low hazard potential and a moderate risk assessment rating, Willow Creek Subwatershed Site M-2 is vital for water resource management in the region. While the dam's condition assessment is not rated, it is regularly inspected for operation and enforcement compliance by the state regulatory agency. The dam has an uncontrolled spillway type and has not been modified since its completion, indicating a stable structure that contributes to the overall water management plan in the area.
For water resource and climate enthusiasts, Willow Creek Subwatershed Site M-2 serves as a key infrastructure for maintaining water quality and quantity in the region. With its strategic location on TR-Wolf Creek and its multi-purpose design, this dam plays a crucial role in flood risk reduction and ecosystem protection. As part of the broader water resource management strategy in Woodbury County, Iowa, this dam exemplifies the collaboration between local government, state agencies, and federal design partners to ensure sustainable water management practices for the community.
Year Completed |
1968 |
Dam Length |
950 |
Dam Height |
38 |
River Or Stream |
TR-WOLF CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.2 |
Drainage Area |
0.77 |
Nid Storage |
115 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14900cfs |
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.
Willow Creek Subwatershed Site M-2