Iowa Noname41 Reservoir Report
Last Updated: December 13, 2025
Iowa Noname41 is a local government-owned earth dam located in Pottawattamie, Iowa, designed by USDA NRCS and regulated by the Iowa Department of Natural Resources.
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Summary
Completed in 1970, this dam serves multiple purposes including fire protection, stock watering, and recreational activities. With a height of 33 feet and a length of 402 feet, it has a storage capacity of 36 acre-feet and covers a surface area of 1.8 acres.
Situated on TR-Mosquito Creek, Iowa Noname41 has a low hazard potential and a moderate risk assessment. Despite being in a not rated condition, it is inspected, permitted, and enforced by the state regularly. The dam's primary purpose is to provide essential services while also offering recreational opportunities for the local community. With its location in Underwood, Iowa, this dam is a crucial water resource structure in the area, ensuring water supply and environmental sustainability for the region.
Managed by the Natural Resources Conservation Service, Iowa Noname41 plays a vital role in water management and environmental conservation in the region. With its state-regulated status and adherence to inspection and enforcement protocols, this dam exemplifies responsible stewardship of water resources. For water resource and climate enthusiasts, Iowa Noname41 serves as a fascinating case study in dam infrastructure and the intersection of human-made structures with natural ecosystems.
Year Completed |
1970 |
Dam Length |
402 |
Dam Height |
33 |
River Or Stream |
TR-MOSQUITO CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.8 |
Drainage Area |
0.22 |
Nid Storage |
36 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Nishnabotna River At Hancock
|
154cfs |
Boyer River At Logan
|
417cfs |
Missouri River At Omaha
|
17700cfs |
East Nishnabotna River Near Atlantic
|
143cfs |
Big Papillion Cr
|
38cfs |
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.
Iowa Noname41