Steamboat
Similar boats were made in 1785 by John Fitch in Philadelphia and William Symington in Dumfries, Scotland. Fitch successfully trialled his boat in 1787, and in 1788, he began operating a regular commercial service along the Delaware River between Philadelphia and Burlington, New Jersey, carrying as many as 30 passengers. This boat could typically make and travelled more than during its short length of service. The Fitch steamboat was not a commercial success, as this travel route was adequately covered by relatively good wagon roads. The following year, a second boat made excursions, and in 1790, a third boat ran a series of trials on the Delaware River before patent disputes dissuaded Fitch from continuing.
Steamboats of the Colorado River
From 1853, ranches were developed nearby up river to supply the fort with beef and barley. That same year gold was found up river. By 1854, copper mines were developed along the river 40 miles above Fort Yuma. The ore provided George A. Johnson & Co. with their first commercial cargo to take to the estuary anchorage. Old Mexican mines where reopened in the interior of the Gadsden Purchase that increased the traffic bringing in machinery and shipping out ore. By 1855, the volume of cargo necessitated putting another boat on the river. By December 1855, Johnson had John G. North build and bring in sections a new steamboat from San Francisco to the Delta estuary. There North assembled and launched the 120 foot long, 80 hp, wood hulled "Colorado". It was capable of carrying 70 tons of cargo while drawing only 2 feet of water and was the first stern-wheeler on the river.
Once the backlog of cargo was relieved by the "Colorado", Johnson looked for ways to keep his boats from being idle. He knew that Brigham Young wanted to establish a route to the Mormon settlements in Utah from the sea up the Colorado River and that merchant interests had been interested in establishing trade with the Mormons by the river route since 1852 when the "Uncle Sam" came to the river. Additionally there was the claim that the river was navigable by steamboat as far as the Virgin River by the fur trapper Antoine Leroux who had successfully rafted down the Colorado from the Virgin River in 1837. In 1856, George A. Johnson was instrumental in getting the support for Congressional funding a military expedition up the river. With those funds Johnson expected to provide the transportation for the expedition but was angry and disappointed when the commander of the expedition Lt. Joseph Christmas Ives rejected his offer of one of his steamboats claiming its cost was too high. Ives, a topographic engineer, used the money to build his own steamboat, the small, iron hulled, sternwheeler "Explorer" in Philadelphia, test it, disassemble and ship it to the Colorado estuary. There at Robinson's Landing, Ives spent a month assembling his steamboat, launching it on December 30, 1857. Johnson had lent Ives one of his men David C. Robinson as a pilot for the expedition, which set off for Fort Yuma the next day.