From National Park Service:
Managers at Great Smoky Mountain National Park have announced that the observation tower at Look Rock on the Foothills Parkway in Blount County, TN will be closed for construction work from Monday, February 27 through Friday, March 23.
During the closure period a new radio repeater will be installed by the Blount County Sheriff's Office to upgrade the radio communications available to Blount County Sheriff's Office and local Emergency Management Services. The paved trail that leads from the Look Rock Parking area to the Tower is also closed at its entrance off the Parkway.
In addition to its role as a public observation tower, the Look Rock Tower hosts an Air Quality monitoring site, and houses radio repeaters serving the Park, the Blount County Sheriff's Office, Ft. Loudon Electric Cooperative, and the U.S.D.A. Forest Service.