06/11/2026
Iowa Time Machine ⏰: On June 11, 1819, steamboat tycoon Joseph “Diamond Jo” Reynolds was born. One of the great builders of the upper Mississippi River economy, Diamond Jo turned grain, steamboats, rail connections, and a knack for logistics into a fortune.
Reynolds worked in several trades before finding his footing in the fast-growing world of grain and transportation. His move to Chicago in 1855 and then to McGregor, Iowa, in 1860 placed him at the center of that transformation. In Iowa, especially, river towns became crucial commercial gateways, and Reynolds was quick to see where profit and infrastructure met.
When he shipped goods under the name J. Reynolds, he discovered that another J. Reynolds already operated in Chicago, so he created a distinctive diamond-shaped trademark around the nickname “Jo”. From there, the label stuck to his business empire. He invested in grain elevators, entered steamboating to gather wheat along the upper Mississippi, and in 1862 had his first steamboat built at Lansing, Iowa.
By 1868, he was building a larger system through the Chicago, Fulton, and River Line, linking boats and barges with the Chicago and North Western Railroad to move wheat east and manufactured goods west. When he moved his office to Dubuque in 1874 and opened a major boatyard at Eagle Point, Iowa became even more central to his enterprise. His boats later shifted from freight to passenger service, and the Diamond Jo Line became the last organized steamboat company operating between St. Louis and St. Paul by 1890.
