Warzyn Reservoir Report

Last Updated: December 13, 2025

Warzyn, located in Iowa, Wisconsin, is a privately-owned earth dam completed in 1974 for recreational purposes.


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Summary

Managed by the Natural Resources Conservation Service, this structure spans 380 feet in length and stands at a height of 25 feet, with a normal storage capacity of 30 acre-feet. Warzyn plays a crucial role in regulating the flow of Urnus Creek, with a low hazard potential and fair condition assessment.

Despite being a relatively modest dam, Warzyn still poses a moderate risk, prompting regular inspections every 10 years. The dam, with a hydraulic height of 17 feet and a maximum discharge capacity of 60 cubic feet per second, showcases its importance in managing water resources in the region. With its uncontrolled spillway and low hazard potential, Warzyn stands as a testament to the collaborative efforts between private owners and regulatory agencies in ensuring the safety and sustainability of water infrastructure.

As climate change continues to impact water resources, structures like Warzyn play a pivotal role in mitigating risks and ensuring water security for communities. By adhering to state regulations and undergoing regular inspections, Warzyn exemplifies the importance of proactive maintenance and risk management measures in safeguarding critical water infrastructure. For water resource and climate enthusiasts, Warzyn serves as a case study in the intersection of recreation, regulation, and resilience in the face of changing environmental conditions.

Year Completed

1974

Dam Length

380

Dam Height

25

River Or Stream

URNUS CREEK

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

17

Drainage Area

1

Nid Storage

100

Structural Height

25

Hazard Potential

Low

Nid Height

25
       
Seasonal Comparison

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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.