Erie southward, and entered the stream which was later known as the Ohio, and passed down this waterway perhaps to the present site of Louisville, Kentucky. If modern scholarship in this case is correct, La Salle was the discoverer of the sweeping Ohio, having come to it over the Lake Erie–Rivière aux Bœufs portage, or the Lake Erie–Chautauqua portage. There is little reason to believe he ascended the Cuyahoga and descended the Tuscarawas and Muskingum as has been feebly asserted. The Ohio, if it was at this time actually discovered by La Salle, remained almost unknown for nearly a century.
In 1672 Frontenac detailed Joliet to make the discovery of the Mississippi and the adventurer went westward to Mackinaw where he met Marquette. The two went down Green Bay, up the Fox, and across the portage to the Wisconsin; on June 17, 1673, they entered the Mississippi River. Returning, they ascended the Illinois and (probably) the Kankakee; crossing the portage to the St. Joseph they were again afloat on Lake Michigan.
