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Timothy H. O'Sullivan
The start from Camp Mojave, Arizona, September 13, 1871.
[Wheeler Survey, Explorations and Surveys West of the 100th Meridian]
1871-1874 (survey), 1871, 13 September (taken)
1. The start from Camp Mojave, Arizona, September 13, 1871. Boat expedition under Lieutenant Wheeler, the first and only one to ascend the Colorado through the Grand Caħon to mouth of Diamond Creek. Distance traveled, 260 miles in 31 days, the boats often having to be portaged around rapids and drawn over rocks.