Croy Subwatershed Site G5-1890 Reservoir Report
Last Updated: December 14, 2025
Located in Monona, Iowa, the Croy Subwatershed Site G5-1890 is a local government-owned earth dam completed in 1951 by the USDA NRCS.
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Summary
This dam serves multiple purposes, including fire protection, stock, small fish pond maintenance, and flood risk reduction. With a height of 27 feet and a storage capacity of 20 acre-feet, this dam plays a crucial role in managing water resources in the area.
Situated on the TR- MAPLE RIVER, this dam has a low hazard potential and is not currently rated for its condition. Despite this, the Iowa Department of Natural Resources regulates and inspects the site to ensure its safety and compliance with state regulations. The dam's risk assessment is moderate, highlighting the importance of ongoing monitoring and maintenance to mitigate any potential risks associated with its operation.
Although the Croy Subwatershed Site G5-1890 has not been recently inspected, its strategic location and purpose make it a key asset for water resource management in the Little Sioux area. With the potential for flood risk reduction and other benefits, this dam serves as a vital piece of infrastructure in maintaining the health and resilience of the local ecosystem in Iowa.
Year Completed |
1951 |
Dam Height |
27 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.05 |
Nid Storage |
20 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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 G5-1890