Croy Subwatershed Site A3-1050 Reservoir Report
Last Updated: December 14, 2025
Croy Subwatershed Site A3-1050, located in Monona, Iowa, is a key water resource managed by the local government and regulated by the Iowa Department of Natural Resources.
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Summary
Built in 1951 by the USDA NRCS, this earth dam stands at a height of 30 feet and serves multiple purposes including fire protection, livestock management, and small fish pond creation. With a storage capacity of 92 acre-feet, the dam covers a surface area of 4 acres and drains a watershed area of 0.57 square miles along the TR-Maple River.
Despite its low hazard potential, the dam at Croy Subwatershed Site A3-1050 is considered to have a moderate risk level. The condition assessment is currently not rated, and there is no documented emergency action plan in place. The spillway type is uncontrolled, with no outlet gates or locks present. It is important for water resource and climate enthusiasts to monitor and assess the risk management measures for this dam, as it plays a crucial role in flood risk reduction and water storage in the region.
Year Completed |
1951 |
Dam Height |
30 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.57 |
Nid Storage |
92 |
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 A3-1050