Nepper Subwatershed Site 3348 Reservoir Report
Last Updated: December 14, 2025
Nepper Subwatershed Site 3348, located in Monona, Iowa, is a dam with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
The dam, constructed in 1948 by the USDA NRCS, is an earth-type structure with a height of 32 feet and a storage capacity of 18 acre-feet. Situated on TR-McClarey Creek, the dam serves the important function of protecting the surrounding area from potential flooding events.
Managed by the Iowa DNR, Nepper Subwatershed Site 3348 is regulated and inspected by state authorities to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating, the dam is considered to be in satisfactory condition. While its spillway is uncontrolled, the dam plays a crucial role in managing water resources in the region, offering protection against floods and supporting wildlife habitats. For water resource and climate enthusiasts, Nepper Subwatershed Site 3348 presents a fascinating case study in dam infrastructure and management practices in the state of Iowa.
Year Completed |
1948 |
Dam Height |
32 |
River Or Stream |
TR- MC CLAREY CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.08 |
Nid Storage |
18 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
West Fork Ditch At Hornick
|
80cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
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 3348