Twin Falls Reservoir Report
Last Updated: December 5, 2025
Twin Falls, also known as Michigamme, is a privately owned hydroelectric dam located in Aurora, Wisconsin.
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Summary
Built in 1912 on the Menominee River, this gravity dam stands at 56 feet tall with a hydraulic height of 44 feet and a structural height of 56 feet. The dam has a storage capacity of 10,000 acre-feet and covers a surface area of 1120 acres, serving both hydroelectric and recreational purposes.
With a maximum discharge of 40,480 cubic feet per second, Twin Falls has a controlled spillway and is classified as having a high hazard potential. Despite its age, the dam's condition assessment is not rated, indicating the need for further inspection and evaluation. The risk assessment for Twin Falls is very high, warranting risk management measures to ensure the safety and stability of the structure.
As a significant part of the hydroelectric infrastructure in the region, Twin Falls plays a crucial role in both water resource management and climate adaptation efforts. Its location on the Menominee River, along with its historic significance and high hazard potential, make Twin Falls a site of interest for water resource and climate enthusiasts looking to understand the intersection of human infrastructure and natural ecosystems.
Year Completed |
1912 |
Dam Length |
800 |
Dam Height |
56 |
River Or Stream |
MENOMINEE |
Primary Dam Type |
Gravity |
Surface Area |
1120 |
Hydraulic Height |
44 |
Drainage Area |
1790 |
Nid Storage |
10000 |
Structural Height |
56 |
Hazard Potential |
High |
Nid Height |
56 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Menominee River At Twin Falls Near Iron Mt
|
3420cfs |
Menominee River Near Florence
|
950cfs |
Pine River Below Pine R Powerplant Nr Florence
|
273cfs |
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
Twin Falls Flowage -- Access