Nutt Hollow Subwatershed Site M-6842 Reservoir Report
Last Updated: December 14, 2025
Located in Monona County, Iowa, the Nutt Hollow Subwatershed Site M-6842 is a local government-owned dam built in 1958 by the USDA NRCS.
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Summary
The dam's primary purpose is for fire protection, stock, and small fish pond, with additional functions including flood risk reduction. The earth dam stands at a height of 26 feet and has a storage capacity of 89 acre-feet, with a normal storage level of 32 acre-feet covering a surface area of 3.7 acres in the TR-MAPLE RIVER watershed.
Managed by the Iowa Department of Natural Resources, this dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and compliance with regulations. With a low hazard potential and a moderate risk rating, the Nutt Hollow Subwatershed Site M-6842 provides essential water resource management for the surrounding area. Although not currently rated for its condition assessment, the dam serves as a critical infrastructure for both water supply and flood control in the region.
In the event of an emergency, the dam's Emergency Action Plan is yet to be prepared, raising concerns about its readiness. However, with its designated purpose and functions, the Nutt Hollow Subwatershed Site M-6842 stands as a key component in the water resource management system of Monona County, Iowa, showcasing the importance of proper infrastructure for both environmental conservation and community safety.
Year Completed |
1958 |
Dam Length |
30 |
Dam Height |
26 |
River Or Stream |
TR-MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.7 |
Drainage Area |
0.82 |
Nid Storage |
89 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
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-6842