Croy Subwatershed Site 22200 Reservoir Report
Last Updated: December 14, 2025
Croy Subwatershed Site 22200, located in Monona County, Iowa, is a low hazard earth dam completed in 1951 for purposes including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
Managed by the local government and designed by USDA NRCS, this dam has a storage capacity of 27 acre-feet and a surface area of 1 acre. Situated on TR- MAPLE RIVER, this dam serves as an essential resource for water management in the area.
With a moderate risk level and a low hazard potential, Croy Subwatershed Site 22200 is regulated by the Iowa Department of Natural Resources and undergoes state permitting, inspection, and enforcement. The dam has not been rated for condition assessment, and its emergency action plan status is currently unknown. Although the dam does not have a spillway, its uncontrolled design and soil foundation ensure its stability and functionality in managing water flow in the region.
Water resource and climate enthusiasts will appreciate the role of Croy Subwatershed Site 22200 in mitigating flood risks, providing water for fire protection and livestock, and supporting local ecosystems. As a key component of the water infrastructure in Monona County, this dam highlights the importance of sustainable water management practices and the collaboration between local government agencies and federal partners like USDA NRCS in ensuring the safety and efficiency of water resource projects.
Year Completed |
1951 |
Dam Height |
28 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.37 |
Nid Storage |
27 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
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 |
West Fork Ditch At Hornick
|
80cfs |
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.
Croy Subwatershed Site 22200