Nutt Hollow Subwatershed Site 2-6161 Reservoir Report
Last Updated: December 14, 2025
Nutt Hollow Subwatershed Site 2-6161, located in Monona County, Iowa, is a local government-owned earth dam constructed in 1958 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
°F
°F
mph
Wind
%
Humidity
Summary
This dam, situated on TR- GARD CREEK, has a height of 18 feet and a length of 380 feet, providing a storage capacity of 55 acre-feet. With a low hazard potential and a moderate risk assessment rating, this dam serves as a vital infrastructure for flood risk reduction within the region.
Managed by the Iowa Department of Natural Resources, Nutt Hollow Subwatershed Site 2-6161 is subject to state regulation, permitting, inspection, and enforcement to ensure its structural integrity and functionality. Despite being not rated in terms of condition assessment, this dam has a normal storage capacity of 11 acre-feet, covering a surface area of 3 acres within its drainage area of 0.68 square miles. As a key component of the local water resource management system, this dam plays a crucial role in mitigating potential flood risks and enhancing water availability for various purposes.
With a spillway type of uncontrolled and no outlet gates, Nutt Hollow Subwatershed Site 2-6161 is designed to manage water flow efficiently during periods of heavy rainfall or flooding. Although the dam has not been modified in recent years and lacks an emergency action plan, it remains a significant asset for the community. As water resource and climate enthusiasts, understanding the importance of structures like this dam in sustainable water management efforts is essential for ensuring the resilience of our ecosystems and communities in the face of climate change challenges.
Year Completed |
1958 |
Dam Length |
380 |
Dam Height |
18 |
River Or Stream |
TR- GARD CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.68 |
Nid Storage |
55 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
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
|
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 2-6161