Turtle-Flambeau Detached Dike 4 Reservoir Report

Last Updated: December 5, 2025

Turtle-Flambeau Detached Dike 4 is a crucial structure located in Iron, Wisconsin, managed by a Public Utility, with ownership falling under the Federal Energy Regulatory Commission.


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Summary

This earth dam stands at a height of 17 feet and has a storage capacity of 239,000 acre-feet, serving as a vital tool for water resource management in the region. Despite its low hazard potential, the dam has not been inspected since August 2016, raising concerns about its current condition and the need for regular assessments to ensure its effectiveness in flood control and water storage.

The Turtle-Flambeau Detached Dike 4 is one of eight associated structures in the area, playing a key role in regulating water levels and protecting the surrounding environment. While the dam has not undergone recent inspections, it is designed to withstand potential risks and is equipped with emergency action plans, although the last revision dates back to November 2001. With its strategic location and significant storage capacity, the dam contributes to the overall water management efforts in the region, emphasizing the importance of regular maintenance and monitoring to ensure its continued functionality in the face of changing climate patterns and water resource demands.

Dam Height

17

Primary Dam Type

Earth

Surface Area

13798

Nid Storage

239000

Hazard Potential

Low

Nid Height

17
       
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.