Gross Dam Reservoir Report
Nearby: Victora Dam Cummins Dam
Last Updated: December 14, 2025
Gross Dam, located in Adair, Iowa, is a privately owned structure designed by SCS and completed in 1989.
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Summary
The dam serves multiple purposes, including fire protection and creating a small fish pond. With a height of 31 feet and a length of 450 feet, Gross Dam has a storage capacity of 45 acre-feet and covers a surface area of 2.8 acres. It is regulated by the Iowa Department of Natural Resources and is classified as having a low hazard potential.
Despite being primarily used for fire protection and stock purposes, Gross Dam also plays a role in managing water resources in the area. The dam is situated on the TR-Middle Nodaway River and is designed as an earth dam with a soil foundation. While it currently holds a moderate risk rating, the dam has not been inspected for condition assessment, and its emergency action plan status remains unknown. Overall, Gross Dam stands as a vital infrastructure component in the region's water resource management and climate resilience efforts.
Year Completed |
1989 |
Dam Length |
450 |
Dam Height |
31 |
River Or Stream |
TR-MIDDLE NODAWAY RIVER |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.16 |
Nid Storage |
45 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Gross Dam