Surficial mapping based on digital soil maps along the Hiwassee and Ocoee Rivers in western Polk County, Tennessee, shows almost 100 square kilometers of alluvium. By far the most extensive is high-level alluvium resting on carbonate bedrock, mainly on the Knox Group. This old alluvium covers rolling topography at elevations of roughly 15 m or greater above the modern river level (ARL), extending to 80 m ARL locally. It is highly weathered, with B horizons having clay percentages exceeding 50 percent and Munsell hues of typically 2.5YR. Sandstone clasts, where present, generally are decomposed. Deposits lower than 15 m ARL occur on floodplains and low terraces are much less weathered, with clay percentages less than 30 and colors no redder than 7.5YR. Pebbles and cobbles of vein quartz attest to the origin of most alluvium in the Blue Ridge province. Such clasts become less common with increasing height ARL, and at the highest levels regolith consists of scattered quartz clasts mixed with carbonate residuum. Alluvial deposits generally occur within 4 km of the main rivers. An exception is a band of high-level alluvium extending from the Ocoee south-southwesterly to the Conasauga River near the Tennessee-Georgia border. This band crosses a prominent divide between the Tennessee and Coosa River basins where only small, local streams flow today. Its presence suggests either that the Conasauga, currently a tributary to the Coosa, once flowed north to the Tennessee River, or else that the Ocoee, now a tributary of the Tennessee, once flowed south to the Coosa.