Rohwer Dam Reservoir Report

Last Updated: December 14, 2025

Rohwer Dam, located in Pottawattamie County, Iowa, is a privately owned structure designed by the USDA NRCS and regulated by the Iowa DNR.


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Summary

Completed in 1962, this earth dam stands at a height of 22 feet and has a length of 670 feet, with a storage capacity of 80 acre-feet. The primary purpose of Rohwer Dam is for fire protection, stock, or as a small fish pond, serving the Walnut Creek area.

With a low hazard potential and a moderate risk assessment rating, Rohwer Dam has not been rated for its condition assessment. Despite its age, the dam has not undergone any modifications and has not been inspected since 1963. It operates as an uncontrolled spillway type with no outlet gates, and its emergency action plan status remains unknown. The dam's location in a rural setting underscores its importance in providing critical water resources for both human and wildlife needs in the area.

For water resource and climate enthusiasts, Rohwer Dam serves as a vital structure in managing water levels and providing essential services to the community. Its history, design, and purpose highlight the symbiotic relationship between human activity and environmental conservation efforts. As climate change continues to impact water resources, dams like Rohwer play a crucial role in ensuring the sustainable management of water for future generations.

Year Completed

1962

Dam Length

670

Dam Height

22

River Or Stream

TR-WALNUT CREEK

Primary Dam Type

Earth

Surface Area

6.6

Drainage Area

0.46

Nid Storage

80

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
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.