Nutt Hollow Subwatershed Site 3-3075 Reservoir Report
Last Updated: December 15, 2025
Nutt Hollow Subwatershed Site 3-3075, located in Monona County, Iowa, is a vital earth dam structure designed by the USDA NRCS in 1958 for multiple purposes including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
This site, situated along the TR-MAPLE RIVER, has a capacity of 63 acre-feet and a surface area of 3.5 acres, serving as a key water resource management infrastructure in the region. Despite its low hazard potential and moderate risk assessment score of 3, the dam's condition is currently not rated, emphasizing the need for regular inspections and maintenance to ensure its continued functionality.
Owned and regulated by the local government and Iowa DNR, Nutt Hollow Subwatershed Site 3-3075 plays a crucial role in water management and conservation efforts in the area. With a state-regulated status and necessary permitting, inspection, and enforcement protocols in place, the dam ensures effective flood risk reduction and water storage capabilities for the surrounding communities. Additionally, the dam's strategic location and design contribute to its operational efficiency and overall resilience in the face of potential climate challenges and evolving water resource management needs.
As a part of the Rock Island District, the Nutt Hollow Subwatershed Site 3-3075 serves as a valuable asset for the region's water infrastructure, providing essential water supply and flood protection benefits. With its primary purpose focused on safeguarding against fire, supporting livestock, and maintaining small fish ponds, this earth dam structure underscores the importance of sustainable water resource management practices in ensuring the resilience and sustainability of local ecosystems. As water resource and climate enthusiasts, understanding and supporting the maintenance and enhancement of such critical infrastructure is vital for promoting long-term water security and environmental sustainability in the region.
Year Completed |
1958 |
Dam Length |
510 |
Dam Height |
32 |
River Or Stream |
TR-MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.5 |
Drainage Area |
0.35 |
Nid Storage |
63 |
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 |
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 3-3075