Steamboats provided the basis of transportation for the Northwest for much of the latter part of the 19^th century.  Railroads and, later, truck traffic ended the golden age of river transport.  In Oregon, the Willamette Valley was welded together for much of fifty plus years by little steamboats making their way up and down the river.  They braved high waters and with designs allowing for small drafts, they puffed along their way in periods of low water, as well.  One of the steamboat lines coming late to the game was one of the more dramatic, made so by the yellow smoke stacks sprouting off all of their boats.  This was the Yellow Stack Line.