Nutt Hollow Subwatershed Site 2-3176 Reservoir Report
Last Updated: December 15, 2025
Nutt Hollow Subwatershed Site 2-3176, located in Monona, Iowa, is a significant earth dam completed in 1958 by the USDA NRCS with the primary purpose of fire protection, stock, or small fish pond.
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Summary
This dam on TR-Maple River stands at a height of 38 feet and has a length of 540 feet, providing a storage capacity of 82 acre-feet. The surrounding area covers 4 acres with a drainage area of 0.36 square miles, serving as a flood risk reduction measure for the local community.
Owned and regulated by the Iowa Department of Natural Resources, this low hazard potential dam has not been rated for its condition. Despite this, the risk assessment deems it as moderate, highlighting the need for ongoing monitoring and maintenance. With its uncontrolled spillway type, Nutt Hollow Subwatershed Site 2-3176 remains a key structure in the region, ensuring water resource management and environmental protection. As climate enthusiasts and water resource stakeholders, it is vital to recognize the importance of such infrastructure in mitigating flood risks and safeguarding local ecosystems.
Year Completed |
1958 |
Dam Length |
540 |
Dam Height |
38 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.36 |
Nid Storage |
82 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
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 |
Missouri River At Decatur
|
14800cfs |
Soldier River At Pisgah
|
112cfs |
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.
Nutt Hollow Subwatershed Site 2-3176