Lake Of The Falls Reservoir Report

Last Updated: December 5, 2025

Lake of The Falls, located in Iron County, Wisconsin, is a picturesque reservoir with a primary purpose of recreation.


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Summary

The dam, completed in 1895, stands at a height of 12 feet and has a hydraulic height of 4 feet, serving as a vital structure for water resource management in the area. With a storage capacity of 3700 acre-feet and a surface area of 338 acres, the reservoir provides ample opportunities for outdoor activities such as boating, fishing, and swimming.

Managed by the Wisconsin Department of Natural Resources, Lake of The Falls boasts a low hazard potential and is classified as being in satisfactory condition as of September 2016. The reservoir's spillway, with a width of 204 feet, is uncontrolled, allowing for natural water flow management. In the event of an emergency, the dam has an established Emergency Action Plan (EAP) to ensure the safety of nearby residents and visitors. Despite moderate risk assessments, the dam's risk management measures are currently unspecified.

With a rich history dating back over a century, Lake of The Falls continues to be a beloved destination for water and climate enthusiasts. Its serene waters, diverse recreational opportunities, and responsible management practices make it a valuable resource for both locals and visitors seeking to connect with nature and enjoy the beauty of Wisconsin's natural landscapes.

Years Modified

1992 - Other, 2004 - Other

Year Completed

1895

Dam Length

300

Dam Height

12

River Or Stream

TURTLE

Primary Dam Type

Earth

Surface Area

338

Hydraulic Height

4

Drainage Area

136

Nid Storage

3700

Structural Height

12

Hazard Potential

Low

Nid Height

12
       
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.