Greubel Dam Reservoir Report

Last Updated: December 8, 2025

Greubel Dam in Iowa, managed by a private entity, was completed in 1962 for fire protection, stock, and small fish pond purposes.


°F

°F

mph

Wind

%

Humidity

Summary

The dam is of earth type with a height of 26 feet and a length of 504 feet, providing a storage capacity of 49 acre-feet. Located in Warren County near Red Rock Reservoir, the dam regulates the flow of TR-Flank Creek and covers a surface area of 3.7 acres with a drainage area of 0.16 square miles.

Despite being classified as having a low hazard potential, Greubel Dam's condition is currently unrated, with its last inspection conducted in 1967. The dam is under state jurisdiction and regulated by the Iowa Department of Natural Resources, with permitting, inspection, and enforcement protocols in place. While the risk assessment for the dam is moderate, with a rating of 3, further details on risk management measures and emergency preparedness are not provided in the available data. Overall, Greubel Dam stands as a vital infrastructure contributing to water resource management in the region.

Year Completed

1962

Dam Length

504

Dam Height

26

River Or Stream

TR-FLANK CREEK

Primary Dam Type

Earth

Surface Area

3.7

Drainage Area

0.16

Nid Storage

49

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
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.