Iowa Noname48 Reservoir Report
Last Updated: December 14, 2025
Located in Shelby County, Iowa, the Iowa Noname48 dam is a local government-owned structure designed by the USDA NRCS.
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Summary
Completed in 1960, this earth dam serves multiple purposes including fire protection, stock, and small fish pond management. With a height of 40 feet and a length of 937 feet, the dam has a storage capacity of 143 acre-feet and covers a surface area of 7.3 acres.
Managed by the Iowa Department of Natural Resources, the dam is regulated, permitted, inspected, and enforced by state authorities. Despite having a low hazard potential, the dam is considered to have a moderate risk level. The spillway type is uncontrolled, and the dam is situated on TR-Mill Creek, a tributary of the Rock Island District. Congressman Steve King represents the area where the dam is located.
Water resource and climate enthusiasts will find Iowa Noname48 an interesting structure for its multifunctional use and its management under state jurisdiction. The dam's historical significance, design, and purpose add to the rich environmental landscape of the region. The dam's risk assessment and regulatory framework provide insights into the challenges and opportunities for sustainable water management in Iowa.
Year Completed |
1960 |
Dam Length |
937 |
Dam Height |
40 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.3 |
Drainage Area |
0.91 |
Nid Storage |
143 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Maple River At Mapleton
|
323cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Nishnabotna River At Hancock
|
154cfs |
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 Noname48