Andrew Dam Reservoir Report
Nearby: Saxton Dam #3 Saxton Dam
Last Updated: December 10, 2025
Andrew Dam, located in Decatur County, Iowa, is a private earth dam constructed in 1983 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
°F
°F
mph
Wind
%
Humidity
Summary
The dam stands at a height of 30 feet with a length of 233 feet, providing a storage capacity of 25 acre-feet and covering a surface area of 2.3 acres. Despite being classified as having low hazard potential, the dam is regulated, permitted, inspected, and enforced by the Iowa Department of Natural Resources, ensuring its safety and compliance with state regulations.
Situated on the TR- MC GRUDER CR. stream, Andrew Dam is designed to control water flow and prevent flooding in the surrounding area. With a moderate risk assessment score of 3, the dam's condition is currently rated as "Not Rated," indicating the need for further evaluation. The dam's emergency action plan status, inundation maps, and risk management measures are currently not available, highlighting areas for improvement in emergency preparedness.
Owned privately and operated for multiple beneficial purposes, Andrew Dam serves as a vital infrastructure for water resource management in the region. As a key component in the local water system, the dam's importance lies in its contribution to fire protection, livestock, and aquatic habitats, emphasizing the interconnectedness of water resources, climate, and human activities in the area.
Year Completed |
1983 |
Dam Length |
233 |
Dam Height |
30 |
River Or Stream |
TR- MC GRUDER CR. |
Primary Dam Type |
Earth |
Surface Area |
2.3 |
Drainage Area |
0.1 |
Nid Storage |
25 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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.
Andrew Dam