Nutt Hollow Subwatershed Site M-3650 Reservoir Report
Last Updated: December 14, 2025
Nutt Hollow Subwatershed Site M-3650 is a low hazard potential earth dam located in Monona, Iowa, designed by the USDA NRCS in 1958 for fire protection, stock, and small fish pond purposes.
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Summary
The dam stands at a height of 24 feet with a length of 495 feet, providing a storage capacity of 80 acre-feet and serving a drainage area of 0.45 square miles. Situated on the TR-MAPLE RIVER, this dam plays a crucial role in flood risk reduction and water resource management in the region.
Managed by the local government with oversight from the Iowa DNR, Nutt Hollow Subwatershed Site M-3650 is monitored for state regulation, permitting, inspection, and enforcement. Despite being classified as low hazard potential with a moderate risk assessment, the dam's condition assessment is not rated, and there is limited information on emergency action plans and risk management measures. However, with its strategic location and functional design, this dam continues to contribute to water conservation efforts and climate resilience in the area.
As a significant infrastructure for water resource management in the region, Nutt Hollow Subwatershed Site M-3650 showcases the collaboration between federal agencies like the USDA NRCS and state authorities in ensuring the safety and effectiveness of dam operations. With its historical significance dating back to 1958, this earth dam remains a vital component in the local landscape, providing essential services for fire protection, stock, fish pond maintenance, and flood risk mitigation. As water resource and climate enthusiasts, understanding the role of structures like Nutt Hollow Subwatershed Site M-3650 is paramount in fostering sustainable practices and safeguarding natural ecosystems for future generations.
Year Completed |
1958 |
Dam Length |
495 |
Dam Height |
24 |
River Or Stream |
TR-MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.45 |
Nid Storage |
80 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14900cfs |
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 M-3650