Croy Subwatershed Site M-6159 Reservoir Report
Last Updated: December 14, 2025
Located in Monona County, Iowa, the Croy Subwatershed Site M-6159 is a crucial water management structure designed by the USDA NRCS for fire protection, stock, and small fish pond purposes, as well as flood risk reduction.
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Summary
Completed in 1952, this earth dam stands at a height of 24 feet and has a storage capacity of 61 acre-feet, serving a drainage area of 1.04 square miles along the TR-Maple River.
With a low hazard potential and a moderate risk assessment score of 3, the Croy Subwatershed Site M-6159 is regulated by the Iowa DNR and subject to state permitting, inspection, and enforcement. Although its condition has not been rated, the dam continues to fulfill its intended functions, safeguarding the surrounding area from potential water-related hazards. As a part of the local government's infrastructure, this site plays a vital role in water resource management in the region, showcasing the importance of sustainable water practices in addressing climate challenges.
Year Completed |
1952 |
Dam Height |
24 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
1.04 |
Nid Storage |
61 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
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 M-6159