The northbound lanes of Highway 99 opened at Applegate Road at 5 a.m. on Monday.
Closures will take place starting at 9 p.m. and go until 5 a.m. overnight through Nov. 10.
Drivers heading that direction will be able to take a detour at the Atwater Boulevard exit.
The emergency repairs come after the overcrossing was hit by a big rig more than two weeks ago.
After an inspection by Caltrans, the department determined the overpass was damaged and needed repairs.