Spillers Dam Reservoir Report

Last Updated: December 12, 2025

Spillers Dam, located in Dallas County, Iowa, was completed in 1962 by the USDA NRCS and serves primarily for fire protection and as a small fish pond.


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Summary

With a height of 28 feet and a length of 327 feet, the dam has a storage capacity of 39 acre-feet and covers a surface area of 2.8 acres. It is regulated by the Iowa Department of Natural Resources and is regularly inspected, ensuring its structural integrity and safety.

Despite its low hazard potential, Spillers Dam poses a moderate risk due to its age and lack of recent condition assessments. The dam features an uncontrolled spillway and is situated on the TR-South Raccoon River. Its location in the Rock Island District makes it an essential water resource for the surrounding area, providing both fire protection and recreational opportunities for the community. As a private-owned structure, Spillers Dam plays a crucial role in water management and conservation efforts in Iowa.

In conclusion, Spillers Dam stands as a testament to effective collaboration between private owners and government agencies in maintaining water resources for multiple purposes. With proper regulatory oversight and continued inspections, this earth dam continues to serve its intended functions while contributing to the overall resilience of the region's water infrastructure. For water resource and climate enthusiasts, Spillers Dam represents a case study in sustainable water management practices and the importance of proactive maintenance and risk assessment.

Year Completed

1962

Dam Length

327

Dam Height

28

River Or Stream

TR-SOUTH RACCOON RIVER

Primary Dam Type

Earth

Surface Area

2.8

Drainage Area

0.13

Nid Storage

39

Hazard Potential

Low

Foundations

Soil

Nid Height

28
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.