Turtle-Flambeau Detached Dike 8 Reservoir Report

Last Updated: December 5, 2025

Turtle-Flambeau Detached Dike 8, located in Iron, Wisconsin, is a key public utility structure managed by the Federal Energy Regulatory Commission.


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Summary

This earth dam stands at a height of 7 feet and has a storage capacity of 239,000 acre-feet, serving as a vital resource for water management in the region. Despite its low hazard potential, the dam is subject to state regulatory oversight and enforcement to ensure its safe operation and maintenance.

With a total of 8 associated structures within the Turtle-Flambeau system, including various dam sections, this detached dike plays a crucial role in flood control and water storage. The dam's emergency action plan was last revised in 2001, highlighting the importance of preparedness and risk management in the face of potential emergencies. Although the condition assessment of the dike is currently unavailable, regular inspections are conducted every three years to monitor its integrity and functionality.

Climate and water resource enthusiasts will appreciate the strategic location of Turtle-Flambeau Detached Dike 8, as it contributes to the overall water management infrastructure in Wisconsin. The presence of this earth dam not only helps regulate water levels and prevent flooding but also underscores the collaborative efforts between federal agencies, state regulators, and public utility stakeholders in ensuring the safety and sustainability of water resources in the region.

Dam Height

7

Primary Dam Type

Earth

Surface Area

13798

Nid Storage

239000

Hazard Potential

Low

Nid Height

7
       
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.