Lorenz Dam Reservoir Report

Last Updated: December 5, 2025

Located in Lowell, Iowa, the Lorenz Dam stands as a testament to innovative engineering and environmentally conscious design.


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Summary

Completed in 2012, this private-owned earth dam boasts a height of 28 feet and a storage capacity of 118 acre-feet, primarily serving as a recreational attraction in the area. Designed by James I. Warner, P.E. of Warner Engineering Associates Inc, the dam features a stone core and soil foundation, ensuring its structural integrity for years to come.

Managed by the Iowa Department of Natural Resources, the Lorenz Dam is regulated, permitted, inspected, and enforced to meet state standards, guaranteeing public safety and environmental protection. With a low hazard potential and a moderate risk assessment rating of 3, the dam is equipped with an uncontrolled spillway that is 15 feet wide to manage water flow during peak times. The surrounding area, covering 3 acres, offers a serene escape for water resource and climate enthusiasts to appreciate the beauty of nature while engaging in recreational activities.

As part of the Rock Island District, the Lorenz Dam's presence contributes to the sustainable development of the region, showcasing a harmonious blend of human ingenuity and environmental stewardship. With its strategic location and state-of-the-art design, this dam not only provides leisure opportunities but also serves as a symbol of responsible water resource management in the face of changing climate conditions.

Year Completed

2012

Dam Height

28

Primary Dam Type

Earth

Surface Area

3

Drainage Area

0.12

Nid Storage

118

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.