American Cruise Lines will add another brand-new modern riverboat to its fleet on the Columbia and Snake Rivers in 2021. In just the past few years, American has introduced the first modern riverboats in the USA, built five new small ships, and doubled its capacity on both the Columbia & Snake as well as the Mississippi River. Next year, when American adds its second new 190-guest modern riverboat to the Columbia and Snake, the Line will operate two paddlewheelers and two modern riverboats in the region.