Greenfield Reservoir Dam Reservoir Report
Nearby: Nodaway Lake Dam Iowa Noname65
Last Updated: December 12, 2025
Greenfield Reservoir Dam in Adair, Iowa, was completed in 1979 and serves as a crucial water supply resource for the local community.
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Summary
Owned by the local government, the dam stands at a height of 42 feet and has a storage capacity of 1150 acre-feet, with a normal storage level of 612 acre-feet. The dam, primarily made of earth and stone, spans a length of 990 feet and covers a surface area of 49.6 acres.
Managed by the Iowa Department of Natural Resources, Greenfield Reservoir Dam is subject to state regulations, inspections, and enforcement to ensure its safety and functionality. With a high hazard potential but a satisfactory condition assessment, the dam is considered to have a moderate risk level. In the event of an emergency, the dam has an established Emergency Action Plan (EAP) and designated emergency contacts to respond effectively.
Located along the TR- MIDDLE NODAWAY R., the Greenfield Reservoir Dam plays a vital role in water resource management and climate resilience efforts in the region. Its construction and maintenance are overseen by local government authorities, with a focus on ensuring the safety and reliability of this essential infrastructure for the community's water supply needs.
Year Completed |
1979 |
Dam Length |
990 |
Dam Height |
42 |
River Or Stream |
TR- MIDDLE NODAWAY R. |
Primary Dam Type |
Earth |
Surface Area |
49.6 |
Drainage Area |
1.5 |
Nid Storage |
1150 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Raccoon River At Redfield
|
268cfs |
Middle Raccoon River At Panora
|
92cfs |
East Nishnabotna River Near Atlantic
|
143cfs |
Raccoon River At Van Meter
|
1640cfs |
Middle Raccoon River Near Bayard
|
121cfs |
Raccoon River Near West Des Moines
|
1300cfs |
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.
Greenfield Reservoir Dam