WISCONSIN RIVER, a tributary of the Mississippi, in Wisconsin. It rises in Vieux Desert lake on the N. E. border, and has a general S. course to Portage City, whence it flows a little S. of W. to its mouth 4 m. below Prairie du Chien. Its entire length is estimated at 600 m. It is navigable by small steamers to Portage City, 200 m. above its mouth. At this point it approaches within 1½ m. of the Fox river, with which it is connected by a canal.