Forest Wonder Lake Reservoir Report

Last Updated: December 5, 2025

Forest Wonder Lake is a private dam located in Iron County, Wisconsin, with a primary purpose of recreation.


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Summary

Built in 1932, this gravity-type dam stands at a height of 10 feet and has a storage capacity of 270 acre-feet. The lake covers a surface area of 39 acres and is fed by Swamp Creek, offering visitors a serene natural setting for outdoor activities.

Despite its age, Forest Wonder Lake is in fair condition with a low hazard potential, as indicated by a risk assessment rating of Very High (1). The dam is regulated by the Wisconsin Department of Natural Resources (WIDNR), with regular inspections and enforcement measures in place to ensure its safety and integrity. The last inspection, conducted in October 2017, revealed that the dam meets guidelines and is equipped with a controlled spillway.

For water resource and climate enthusiasts, Forest Wonder Lake provides a fascinating example of a historical dam that continues to serve as a recreational resource while prioritizing safety and regulatory compliance. Its location in a picturesque natural setting, coupled with its modest size and low hazard potential, makes it a hidden gem for those seeking a peaceful escape in the heart of Wisconsin's scenic landscape.

Year Completed

1932

Dam Length

100

Dam Height

10

River Or Stream

SWAMP CREEK

Primary Dam Type

Gravity

Surface Area

39

Hydraulic Height

4

Drainage Area

17

Nid Storage

270

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.