Twin Falls Auxiliary Dike Reservoir Report
Last Updated: December 5, 2025
Located on the Menominee River in Florence, Wisconsin, the Twin Falls Auxiliary Dike is a gravity dam completed in 1912 with a primary purpose of hydroelectric power generation.
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Summary
This structure, with a height of 30 feet and a storage capacity of 9750 acre-feet, serves as a crucial component of the region's water resource management system. The dam not only supports hydroelectric activities but also offers recreational opportunities for visitors in the area.
Managed by the Federal Energy Regulatory Commission, this high-hazard potential dam has a history dating back over a century and remains a key player in the sustainable use of water resources in the region. With a normal storage capacity of 9750 acre-feet and a surface area of 960 acres, the Twin Falls Auxiliary Dike plays a vital role in regulating the flow of the Menominee River and ensuring water security for surrounding communities. As a public utility structure, it reflects the collaboration between federal agencies and local stakeholders in managing water resources for both economic and ecological benefits.
As climate change poses new challenges to water resource management, the Twin Falls Auxiliary Dike stands as a testament to the ongoing efforts to adapt and innovate in the face of evolving environmental conditions. With its long history of service and its strategic location on the Menominee River, this gravity dam continues to be a symbol of resilience and sustainability in the realm of water infrastructure. For water resource and climate enthusiasts, the Twin Falls Auxiliary Dike offers a fascinating case study in the intersection of hydroelectric power generation, recreational use, and environmental stewardship.
Year Completed |
1912 |
Dam Height |
30 |
River Or Stream |
Menominee River |
Primary Dam Type |
Gravity |
Surface Area |
960 |
Nid Storage |
9750 |
Hazard Potential |
High |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Menominee River At Twin Falls Near Iron Mt
|
3420cfs |
Pine River Below Pine R Powerplant Nr Florence
|
273cfs |
Menominee River Near Florence
|
950cfs |
Menominee River At Niagara
|
1260cfs |
Brule River Near Commonwealth
|
428cfs |
Paint River Nr Alpha
|
268cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Twin Falls Auxiliary Dike
Twin Falls Flowage -- Access