Turtle-Flambeau Detached Dike 6 Reservoir Report

Last Updated: December 5, 2025

Turtle-Flambeau Detached Dike 6, located in Iron County, Wisconsin, is a crucial public utility structure managed by the Federal Energy Regulatory Commission.


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Summary

Standing at a height of 7 feet, this earthen dam plays a significant role in water resource management, with a storage capacity of 239,000 acre-feet and a surface area of 13,798 acres. While the dam has a low hazard potential, its condition assessment is currently not available, highlighting the importance of regular inspections and maintenance.

This detached dike is one of eight associated structures under the jurisdiction of the state, with no state regulation but permitting and enforcement authority. Although the last inspection was conducted in August 2016, with a frequency of every three years, the Emergency Action Plan (EAP) for this dam has not been updated since November 2001. Despite the lack of recent risk assessment and management measures, Turtle-Flambeau Detached Dike 6 remains a vital component of the water infrastructure in the region, serving both practical and regulatory purposes.

With its strategic location and significant storage capacity, Turtle-Flambeau Detached Dike 6 stands as a testament to the importance of sustainable water resource management in Wisconsin. As climate change continues to impact water availability and quality, it is crucial for authorities to prioritize the upkeep and monitoring of critical infrastructure like this earthen dam to ensure the safety and security of the surrounding communities and ecosystems.

Dam Height

7

Primary Dam Type

Earth

Surface Area

13798

Nid Storage

239000

Hazard Potential

Low

Nid Height

7
       
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.