Rodney Subwatershed Site 12-2 Reservoir Report
Last Updated: December 14, 2025
Rodney Subwatershed Site 12-2 is a local government-owned dam located in Monona, Iowa, along the TR-Little Sioux River.
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Summary
Built in 1969 by the USDA NRCS, this earth dam stands at a height of 35 feet and spans a length of 532 feet, providing fire protection, stock, and small fish pond purposes. With a storage capacity of 54 acre-feet and a surface area of 2.9 acres, the dam plays a crucial role in flood risk reduction for the surrounding area.
Managed by the Iowa Department of Natural Resources, Rodney Subwatershed Site 12-2 is classified as having a low hazard potential and a moderate risk level. Although its condition is currently not rated, the dam is subject to state regulation and inspection to ensure its continued safety and functionality. The dam's spillway is uncontrolled, and its drainage area is 0.25 square miles, highlighting its importance in managing water resources in the region.
In the event of an emergency, the dam's emergency action plan (EAP) status and risk management measures are not currently specified. However, with its strategic location and purpose, Rodney Subwatershed Site 12-2 serves as a critical infrastructure for both water resource management and climate resilience efforts in the area. Its connection to the TR-Little Sioux River underscores its essential role in protecting the local ecosystem and community from potential flooding events.
Year Completed |
1969 |
Dam Length |
532 |
Dam Height |
35 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
2.9 |
Drainage Area |
0.25 |
Nid Storage |
54 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Rodney Subwatershed Site 12-2