Nepper Subwatershed Site M-5700 Reservoir Report
Last Updated: December 14, 2025
Nepper Subwatershed Site M-5700 in Monona, Iowa, is a local government-owned earth dam completed in 1948 by USDA NRCS.
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Summary
This dam serves multiple purposes including fire protection, stock, and small fish pond, as well as flood risk reduction. Situated on TR-McClarey Creek, the dam has a height of 43 feet and a storage capacity of 43 acre-feet. With a drainage area of 0.2 square miles, the dam has a low hazard potential and a moderate risk assessment rating.
Managed by the Iowa Department of Natural Resources, Nepper Subwatershed Site M-5700 is regulated and permitted by the state. The dam's condition is currently not rated, and it has not undergone recent inspections or maintenance. Despite its relatively small surface area of 1 acre, the dam plays a crucial role in managing water resources in the area. Climate and water resource enthusiasts are encouraged to explore this site to learn more about the intersection of water management, climate resilience, and dam safety in the region.
Year Completed |
1948 |
Dam Height |
43 |
River Or Stream |
TR- MC CLAREY CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.2 |
Nid Storage |
43 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Fork Ditch At Hornick
|
80cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Nepper Subwatershed Site M-5700