UDPATE 10 p.m.
Both accidents have been cleared and all lanes are open, according to the Tennessee Department of Transportation.
UPDATE 9:35 p.m.
The wreck near Exit 2 was cleared. The left lane is still closed about a mile down the interstate after a vehicle overturned.
9:30 p.m.
Two wrecks on I-75 north have closed the left lane at mile marker 1 and Exit 2 in Chattanooga.
An overturned vehicle was reported at mile marker 1 at 8:50 p.m., according to the Tennessee Department of Transportation.
A separate crash at the I-75/I-24 split was reported two minutes later.