Every bit of water between the Watts Bar Dam and Chickamauga dam is technically Chickamauga. There are lots of areas that people refer to, Harrison bay, Chester frost, Hiwassee, etc. Most of the lake above the Hiwassee is more like river, just like the river below Chickamauga dam is technically Nickajack lake but it's mostly river until you almost get to Hale's bar.