In the 1860s Major John Wesley Powell led a pioneering Grand Canyon expedition on this river
[DOC] [TLE] John Wesley Powell - Wikipedia [PAR] John Wesley "Wes" Powell (March 24, 1834  September 23, 1902) was a U.S. 
soldier, geologist, explorer of the American West, professor at Illinois Wesleyan 
University, and director of major scientific and cultural institutions.