The Tennessee water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.
The Tennessee region, which is listed with a 2-digit hydrologic unit code (HUC) of 06, has an approximate size of , and consists of 4 subregions, which are listed with the 4-digit HUCs 0601 through 0604.
This region includes the drainage of the Tennessee River Basin. Includes parts of Alabama, Georgia, Kentucky, Mississippi, North Carolina, Tennessee, and Virginia.
List of water resource subregions Subregion HUC Subregion Name Subregion Description Subregion Location Subregion Size Subregion Map 0601 Upper Tennessee Subregion The Tennessee River Basin above Watts Bar Dam. Georgia, North Carolina, Tennessee, and Virginia. 0602 Middle Tennessee-Hiwassee Subregion The Tennessee River Basin below Watts Bar Dam to and including the Sequatchie River Basin. Alabama, Georgia, North Carolina, and Tennessee. 0603 Middle Tennessee-Elk Subregion The Tennessee River Basin below the confluence with the Sequatchie River Basin to Pickwick Dam. Alabama, Georgia, Mississippi, and Tennessee. 0604 Lower Tennessee Subregion The Tennessee River Basin below Pickwick Dam. Kentucky, Mississippi, and Tennessee.
See also List of rivers in the United States Water Resource Region
References