Croy Subwatershed Site 2530 Reservoir Report
Last Updated: December 13, 2025
Croy Subwatershed Site 2530, located in Monona County, Iowa, is a vital earth dam constructed in 1951 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
°F
°F
mph
Wind
%
Humidity
Summary
This dam stands at a towering height of 46 feet and has a storage capacity of 32 acre-feet, serving the Maple River tributary. Despite being labeled as having a low hazard potential, the site is regulated by the Iowa DNR and undergoes regular state inspections, permitting, and enforcement to ensure its structural integrity and compliance with safety standards.
With a drainage area of 0.15 square miles and a surface area of 2 acres, Croy Subwatershed Site 2530 plays a crucial role in flood risk reduction and water resource management in the region. Although it has not been rated for its condition assessment, the dam remains a key component in the local ecosystem, supporting wildlife habitats and providing essential water resources for the surrounding area. The site's risk assessment is moderate, prompting the need for continued monitoring and risk management measures to safeguard against potential hazards and ensure the longevity of this important water infrastructure.
As an earth dam under the jurisdiction of the Iowa DNR and supported by the Natural Resources Conservation Service, Croy Subwatershed Site 2530 stands as a testament to sustainable water resource management in Iowa. With its strategic location and vital role in fire protection, flood risk reduction, and ecosystem support, this dam serves as a valuable asset for the community of Little Sioux and the broader Monona County area. As water resource and climate enthusiasts, we recognize the significance of this site in maintaining the balance of water resources and environmental resilience in the region.
Year Completed |
1951 |
Dam Height |
46 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.15 |
Nid Storage |
32 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
46 |
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
|
15500cfs |
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 2530