SNOFLO
 



TOMAHAWK

RESERVOIR LEVELS
Rock, Soil Dam Wisconsin River
April 1, 2025


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Tomahawk is a captivating hydroelectric structure located on the Wisconsin River in Merrill, Wisconsin. Built in 1938, this gravity dam stands at a height of 27 feet and spans 3400 feet in length, providing vital storage of 15,180 acre-feet of water. With a maximum discharge capacity of 54,000 cubic feet per second, Tomahawk not only generates hydroelectric power but also offers recreational opportunities for enthusiasts.

Managed by a public utility, Tomahawk is regulated by the Federal Energy Regulatory Commission and is deemed to have a high hazard potential. Despite its age, the dam's structural integrity remains sound, with a recent inspection in September 2020 confirming its condition. In the event of an emergency, there is an Emergency Action Plan in place, ensuring the safety and security of surrounding areas.

This iconic dam, with its multi-arch core structure and controlled spillway, is a testament to the engineering prowess of the Public Utility Engineering and Service Corp. Its strategic location in Lincoln County, Wisconsin, makes it a key player in water resource management and climate resilience efforts for the region. As water resource and climate enthusiasts, the significance of Tomahawk lies not only in its hydroelectric capabilities but also in its role in safeguarding the community and environment against potential risks.

Year_Completed 1938
Dam_Height 27
River_Or_Stream Wisconsin River
Dam_Length 3400
Primary_Dam_Type Gravity
Surface_Area 2773
Hydraulic_Height 27
Drainage_Area 2028
Nid_Storage 15180
Structural_Height 27
Outlet_Gates Slide (sluice gate) - 1, Tainter (radial) - 9
Hazard_Potential High
Foundations Rock, Soil
Nid_Height 27
       



       

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