Waubonsie Cr. Watershed Site 3-6 Reservoir Report
Last Updated: December 13, 2025
Waubonsie Creek Watershed Site 3-6 is a vital water resource located in Mills, Iowa, managed by the local government and designed by USDA NRCS.
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Summary
This site serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The earth dam, completed in 1989, stands at a height of 50 feet and has a storage capacity of 250 acre-feet, with a normal storage of 177 acre-feet over a surface area of 8.5 acres. The dam plays a crucial role in managing water flow and ensuring water security for the surrounding area.
Managed by the Iowa DNR, this watershed site is regulated, permitted, inspected, and enforced to meet state guidelines and ensure its safety and functionality. The dam has a low hazard potential and moderate risk assessment, indicating a need for ongoing monitoring and management. With a drainage area of 0.23 square miles and located along TR- Mc Pherron Creek, this site plays a critical role in flood risk reduction and water management in the region. As a part of the Omaha District, this site contributes to the overall water resource infrastructure in the area.
Overall, Waubonsie Creek Watershed Site 3-6 is a significant water resource infrastructure managed by local government and designed by USDA NRCS to serve multiple purposes including flood risk reduction and water storage. With its earth dam structure and moderate risk assessment, ongoing monitoring and management are essential to ensure its safety and functionality. This site plays a vital role in managing water flow, protecting against floods, and securing water resources for the surrounding community in Mills, Iowa.
Year Completed |
1989 |
Dam Length |
485 |
Dam Height |
50 |
River Or Stream |
TR- MC PHERRON CREEK |
Primary Dam Type |
Earth |
Surface Area |
8.5 |
Drainage Area |
0.23 |
Nid Storage |
250 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
50 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Nishnabotna River At Randolph
|
420cfs |
Weeping Water Creek At Union
|
20cfs |
Missouri River At Nebraska City
|
25100cfs |
Nishnabotna River Above Hamburg
|
605cfs |
Platte R At Louisville Ne
|
6300cfs |
East Nishnabotna River At Red Oak
|
270cfs |
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.
Waubonsie Cr. Watershed Site 3-6
US 34;US 275 Mills County