Greiner Dam Reservoir Report

Last Updated: December 5, 2025

Greiner Dam, located in the Hickory Hills Recreation Area in Tama, Iowa, was completed in 1975 by the USDA NRCS.


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Summary

This private dam has a primary purpose of fire protection, stock, or small fish pond, with a height of 28 feet and a length of 575 feet. With a storage capacity of 96 acre-feet and a surface area of 7.6 acres, the dam serves as a vital resource for water management in the area.

The dam is regulated by the Iowa Department of Natural Resources and undergoes state permitting, inspection, and enforcement to ensure its safety and functionality. Despite being rated as having a low hazard potential, the dam is considered to have a moderate risk level due to its location on TR-Twelve Mile Creek. With its uncontrolled spillway and soil foundation, Greiner Dam plays a crucial role in managing water resources in the region and mitigating potential risks associated with flooding and water scarcity.

Overall, Greiner Dam stands as a testament to the importance of sustainable water resource management in the face of changing climate conditions. As a key infrastructure for fire protection and ecosystem support, this earth dam serves as a critical component of the local water system, highlighting the need for ongoing monitoring and maintenance to ensure its continued effectiveness in the years to come.

Year Completed

1975

Dam Length

575

Dam Height

28

River Or Stream

TR-TWELVE MILE CREEK

Primary Dam Type

Earth

Surface Area

7.6

Drainage Area

0.25

Nid Storage

96

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.