Trappe River

{{Use American English|date=February 2025}}

{{Infobox river

|name = Trappe River

|image = TrappeRiver-2015-03-21.JPG

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|image_caption = Trappe River at Shady Lane Road bridge.

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|source1_coordinates= {{coord|45.1574661|N|89.3501174|W}}

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|mouth_coordinates = {{coord|45.0813564|N|89.6215119|W|display=inline,title}}

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|mouth_elevation = {{convert|1204|ft|m}}

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|tributaries_right = Little Trappe River}}

The Trappe River is a tributary of the Wisconsin River in Marathon County and Langlade County in the state of Wisconsin in the United States. Other spellings include Trapp and Trap.{{GNIS|1575574}} In Ojibwe it was known as Tah-so-so-win-ing Se-be.{{cite journal |last=Calkins |first=Hiram |date=1854 |title=Indian Nomenclature, and the Chippewas |url=http://content.wisconsinhistory.org/cdm/ref/collection/whc/id/15147 |journal=Wisconsin Historical Collections |publisher=State Historical Society of Wisconsin |volume=1 |pages=119–126 |access-date=April 2, 2015 }} Its source is in the town of Ackley and its confluence with the Wisconsin is midway between Merrill and Wausau.

Historically the Trappe River was a rich source of pine timber for mills in Wausau, as well as for a mill at the mouth of the river.{{cite book |last=Marchetti |first=Louis |title=History of Marathon County, Wisconsin and Representative Citizens |url=http://content.wisconsinhistory.org/cdm/ref/collection/wch/id/61858 |access-date=April 2, 2015 |year=1913 |publisher=Richmond-Arnold |location=Chicago }}