The following website contains many interesting tidbits written in 2017 by Marshall Trimble, an Arizona historian, about Hi Jolly and the U.S. Army's Camel Corps related to the Western Beale Wagon Road.
An attached painting of Beale's arrival at the Colorado River as a chartered commercial steamboat was coming up the river to meet them at Fort Mohave is perhaps the clearest one I have seen on the subject.
Keep in mind that Oklahoma's Beale Wagon Road had six Whipple Bowstring Arch Truss Iron Bridges in 1859-60. No others existed west of New York, not one. These bowstrings were 15-years in advance of the 1874 King Arch Bridge that Arkansas claims to be the oldest in Arkansas, and perhaps in the West. So few modern historians know about "our" iron bridges.