By the beginning of the 19th century people began experiments with steam engines for marine power. In 1811, Robert Fulton and Nicholas Roosevelt built the first steam-powered boat, large enough for commercial use on the Ohio and Mississippi Rivers. No one knows what it looked like, for no drawings exist today. However, it proved that a steam-powered paddlewheel boat could be used on inland rivers.
Henry Shreve, a brilliant keelboat man, was the first to build truly a successful paddlewheel riverboat of sufficient size to be profitable, yet able to negotiate shallow rivers. His design became a standard for the Western rivers, and he is credited with launching the modern inland river transportation system.
This type of boat has served as an important mode of transportation on the nation's rivers, including the Sacramento, up through World War II. Today, boats like this still ply the major rivers carrying tourists, but they are mostly Diesel powered and have bow thrusters and non-functional paddlewheels.