Croy Subwatershed Site A3-4908 Reservoir Report
Last Updated: December 14, 2025
Croy Subwatershed Site A3-4908 in Monona, Iowa is a local government-owned earth dam completed in 1951 for fire protection, stock, and small fish pond purposes.
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Summary
Managed by the USDA NRCS, this dam has a height of 30 feet and a storage capacity of 27 acre-feet, serving the Maple River area. Despite its low hazard potential and moderate risk assessment, the dam's condition remains unrated, highlighting the need for regular inspections and maintenance to ensure its continued effectiveness.
Located in Little Sioux, Iowa, this dam plays a crucial role in flood risk reduction for the surrounding area, with a drainage area of 0.12 square miles. While the dam is currently uncontrolled with no spillway width specified, its operational status and emergency preparedness measures are not clearly defined. As climate change continues to impact water resources and infrastructure, proactive risk management and adherence to regulatory guidelines will be essential for ensuring the safety and longevity of Croy Subwatershed Site A3-4908.
With its historical significance and ongoing importance in protecting the local community and environment, Croy Subwatershed Site A3-4908 serves as a tangible example of the vital role that dams and water resources infrastructure play in sustainable development. As water resource and climate enthusiasts, it is crucial to monitor and advocate for the proper management and maintenance of such critical infrastructure to adapt to changing environmental conditions and safeguard against potential hazards.
Year Completed |
1951 |
Dam Height |
30 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.12 |
Nid Storage |
27 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
Soldier River At Pisgah
|
112cfs |
Missouri River At Decatur
|
14900cfs |
West Fork Ditch At Hornick
|
80cfs |
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.
Croy Subwatershed Site A3-4908