Accompanying Stone on the trip were three other boatmen, one of which had made the trip previously. Nathaniel "Than" Galloway traversed the river in 1897, and because of his experience with boating and the makeup of the rivers, Stone asked him to lead the expedition. Seymour S. Dubendorff, a handyman and friend of Galloway, and C. C. Sharp were the other two boatmen asked to join the party. Finally, Stone asked Raymond Cogswell, a man believed now to be Stone's brother-in-law, to take photographs documenting the trip.
The boats in which they travelled were created especially for the trip by Nathaniel Galloway. The flat bottomed boats were 16 1/2 ft long made of white oak and Michigan pine and weighing in at 243 pounds. The boats were new in their design in that they were decked over except for a cockpit in which the oarsman sat; they also had a detachable skag or keel that was at the request of Stone himself.
The expedition took off on September 12, 1909 from Green River City, Wyoming following the same course as the first river trip taken by Major John Wesley Powell in 1869. Passing through 19 canyons along the Green and Colorado Rivers arriving in Needles, California on January 18, 1912. The Stone Party remains now as the seventh complete river trip and the first river trip taken only for sport.
Of the 342 photographs, 114 of them can be found in Stone's book titled Canyon Country along with a re-creation of the journal he kept throughout the trip.
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