A crash with injuries is blocking the southbound of-ramp from state Highway 153 onto Bonny Oaks Drive.
Chattanooga police and fire units and Hamilton County EMS are on the scene.
The Tennessee Department of Transportation said the crash was reported at 3:35 p.m. and is affecting southbound traffic, with the off-ramp blocked. Northbound traffic is being slowed by rubbernecking delays, TDOT said.
The scene is expected to be cleared by 5 p.m.