Amana Millrace Diversion Dam Reservoir Report
Last Updated: December 13, 2025
The Amana Millrace Diversion Dam, located in Iowa along the Iowa River, serves as a vital piece of infrastructure for hydroelectric purposes.
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Summary
Owned privately, this dam is regulated by the Iowa Department of Natural Resources, ensuring that it meets state permitting, inspection, and enforcement requirements. The dam stands at a height of 9 feet and has a storage capacity of 165 acre-feet, playing a crucial role in water resource management in the area.
This diversion dam, with a low hazard potential and a current condition assessment of "Not Rated," has not been modified in recent years. It does not have a designated primary dam type or spillway type and does not feature any outlet gates. Despite its basic structure, the Amana Millrace Diversion Dam contributes significantly to the region's water supply and energy production. As a key component of the local water management system, it plays a vital role in maintaining the ecological balance and supporting the surrounding communities.
While the dam lacks certain detailed data points such as completion year and inspection frequency, its presence is essential for maintaining water flow and supporting hydroelectric operations in the area. With its historical significance and ongoing role in water resource management, the Amana Millrace Diversion Dam remains a notable structure for water resource and climate enthusiasts to study and appreciate in the Iowa landscape.
Dam Length |
178 |
Dam Height |
9 |
River Or Stream |
Iowa River |
Drainage Area |
2829 |
Nid Storage |
165 |
Hazard Potential |
Low |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Iowa River At Marengo
|
818cfs |
Big Bear Creek At Ladora
|
51cfs |
Clear Creek Near Oxford
|
11cfs |
Iowa River Near Belle Plaine
|
966cfs |
Salt Creek Near Elberon
|
42cfs |
Cedar River At Cedar Rapids
|
2160cfs |
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.
Amana Millrace Diversion Dam