Upper Flowage, located in Washburn, Wisconsin, is a privately owned dam with a primary purpose of recreation.
Wind
Humidity
Built in 1915, this gravity dam stands at 12 feet high and spans 100 feet in length, creating a reservoir with a maximum storage capacity of 70 acre-feet. The dam impounds the Crystal Brook, providing a surface area of 13 acres for outdoor enthusiasts to enjoy various water activities.
Despite being classified as a low hazard potential structure, Upper Flowage has a very high risk assessment rating, indicating the importance of proactive risk management measures. The dam is regulated by the Wisconsin Department of Natural Resources (WIDNR) and undergoes regular inspections, with the last one conducted in April 2011. While the condition assessment is currently noted as "Not Rated," the dam's emergency action plan was last revised in January 2013 to ensure preparedness for any unforeseen events.
With its tranquil setting and recreational opportunities, Upper Flowage serves as a valuable resource for both locals and visitors alike. As water resource and climate enthusiasts, it is essential to recognize the significance of maintaining and monitoring such structures to ensure the safety and sustainability of our environment. The collaboration between private ownership, state regulation, and community involvement is crucial in safeguarding the integrity of this dam and preserving the natural beauty of Upper Flowage for future generations to appreciate.
Years Modified |
1924 - Other |
Year Completed |
1915 |
Dam Length |
100 |
Dam Height |
12 |
River Or Stream |
CRYSTAL BROOK |
Primary Dam Type |
Gravity |
Surface Area |
13 |
Hydraulic Height |
3 |
Drainage Area |
3 |
Nid Storage |
70 |
Structural Height |
12 |
Hazard Potential |
Low |
Nid Height |
12 |
St. Croix River Near Danbury
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1650cfs |
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111cfs |
Chippewa River At Bishops Bridge Near Winter
|
251cfs |
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|
668cfs |
Flambeau River Near Bruce
|
616cfs |
Bois Brule River At Brule
|
183cfs |