Rockwood is a city in Roane County, Tennessee, United States. Its population was 5,562 at the time of the 2010 census. It is included in …Rockwood is a city in Roane County, Tennessee, United States. Its population was 5,562 at the time of the 2010 census. It is included in the Harriman, Tennessee Micropolitan Statistical Area. Rockwood is located at 35°52′9″N 84°40′31″W / 35.86917°N 84.67528°W. The city is situated at the base of the eastern escarpment of the Cumberland Plateau, known locally as Walden Ridge. The boundary between the Eastern Time Zone and Central Time Zone runs along Rockwood's western boundary. The Watts Bar Lake impoundment of the Tennessee River provides much of Rockwood's southern boundary.