The Big Eau Pleine River is a river in the U.S. state of Wisconsin.
Eau Pleine is derived from the French phrase meaning "full water" or "stock river".
It is a tributary of the Wisconsin River as the Big Eau Pleine River originates in southern Taylor County near Stetsonville and flows into Marathon County.
The Big Eau Pleine River flows by Stratford then to the enormous Big Eau Pleine Reservoir before it converges into the Wisconsin River.