Waubonsie Cr. Watershed Site 11-1 Reservoir Report
Last Updated: December 13, 2025
Located in Mills, Iowa, Waubonsie Creek Watershed Site 11-1 is a vital flood risk reduction infrastructure managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
Designed by the USDA NRCS and completed in 1977, this earth dam stands at a height of 71 feet and spans 1050 feet, providing storage for up to 1902 acre-feet of water in its reservoir.
With a drainage area of 2.8 square miles and a surface area of 73 acres, this structure plays a crucial role in debris control and flood risk reduction for the surrounding area. Its spillway, of uncontrolled type, has a width of 3 feet, and the dam is rated with a low hazard potential and deemed to be in satisfactory condition during the latest inspection in July 2020. With moderate risk assessment, this site serves as a key player in managing water resources and climate challenges in the region.
Waubonsie Creek Watershed Site 11-1 serves as a testament to the collaboration between local government and federal agencies in mitigating flood risks in the area. As water resource and climate enthusiasts explore the data behind this infrastructure, its significance in protecting the community from potential hazards becomes evident. With a history of successful operation and maintenance, this site stands as a beacon of effective water management practices in Iowa, ensuring the safety and well-being of residents in the face of changing environmental conditions.
Year Completed |
1977 |
Dam Length |
1050 |
Dam Height |
71 |
River Or Stream |
TR-WAUBONSIE CREEK |
Primary Dam Type |
Earth |
Surface Area |
73 |
Drainage Area |
2.8 |
Nid Storage |
1902 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
71 |
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 |
Missouri River At Omaha
|
17700cfs |
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 11-1
US 34;US 275 Mills County