Turtle-Flambeau Detached Dike 7 Reservoir Report

Last Updated: December 5, 2025

Turtle-Flambeau Detached Dike 7, located in Iron, Wisconsin, is a public utility structure managed by the Federal Energy Regulatory Commission.


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Summary

This Earth type dam stands at a height of 8 feet and has a storage capacity of 239,000 acre-feet, with a normal storage level of 135,000 acre-feet. The dam covers a surface area of 13,798 acres and is associated with 8 other structures in the region. Although the hazard potential of the dam is classified as low, it is not currently in inspection due to its condition assessment status being unavailable.

This detached dike, designated as WI00041S006, plays a crucial role in water resource management in the region, contributing to flood control and water storage. The dam has not undergone any modifications in recent years, with its last inspection conducted in August 2016 at a frequency of every 3 years. While the Emergency Action Plan (EAP) for the structure was last revised in November 2001, detailed risk assessment and management measures are yet to be documented. Despite its non-USACE status, the Turtle-Flambeau Detached Dike 7 remains a key component of the water infrastructure in Wisconsin.

Enthusiasts interested in water resources and climate resilience will find Turtle-Flambeau Detached Dike 7 to be a significant structure worth exploring. With its strategic location, storage capacity, and low hazard potential, the dam serves as a vital asset for water management and flood protection in the area. However, the lack of recent inspections and updated emergency response plans highlight the need for continued monitoring and maintenance to ensure the long-term sustainability and effectiveness of this essential water resource infrastructure.

Dam Height

8

Primary Dam Type

Earth

Surface Area

13798

Nid Storage

239000

Hazard Potential

Low

Nid Height

8
       
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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.