Anderson Dam Reservoir Report
Nearby: Fogelman Dam Phillips Dam
Last Updated: December 23, 2025
Anderson Dam, located in Sioux Rapids, Iowa, serves multiple purposes including fire protection, stock, and small fish pond.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 2005 by the NRCS, this private dam stands at a height of 31 feet with a length of 292 feet, providing a storage capacity of 101 acre-feet. Situated on TR- Willow Creek, it is regulated by the Iowa DNR and is inspected, permitted, and enforced by the state authorities. With a low hazard potential and a moderate risk assessment, Anderson Dam is considered to be in fair condition.
Despite being an earth dam with a soil foundation, Anderson Dam is designed to withstand the demands of its primary purposes. While it has an uncontrolled spillway with a width of 2 feet, the dam has not undergone any modifications since its completion. The dam's surface area covers 4.1 acres, serving a drainage area of 0.64 square miles. With a risk assessment indicating moderate risk, Anderson Dam's emergency action plan status and adherence to guidelines remain unspecified, suggesting the need for ongoing risk management measures to ensure the safety of the surrounding area.
Owned by a private entity, Anderson Dam is a vital resource for the community, offering essential services such as fire protection and water storage. As climate change continues to impact water resources, the maintenance and management of dams like Anderson become increasingly crucial in ensuring water security and resilience in the face of changing environmental conditions.
Year Completed |
2005 |
Dam Length |
292 |
Dam Height |
31 |
River Or Stream |
TR- WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.1 |
Drainage Area |
0.64 |
Nid Storage |
101 |
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.
Anderson Dam