Update: One northbound lane has reopened.
The Bradley County Sheriff's Office said the crash involved a car and a tractor-trailer, and that one person was flown to Erlanger hospital in Chattanooga.
A traffic crash has shut down travel on northbound Interstate 75, the Tennessee Department of Transportation reports.
The crash was reported at 3:24 p.m. and is expected to be cleared by 5 p.m. No information was immediately available on how the wreck happened or if anyone was injured.
Southbound lanes were clear, TDOT said.