A big rig and trailer ferrying a huge excavator down Highway 101 hit an overcrossing in northern Petaluma early Monday afternoon, the CHP reported.

With debris on the highway from the 12:32 p.m. crash near Petaluma Boulard North, CHP officers temporarily were closing at least one southbound lane.

Drivers were being directed off of the highway at Petaluma Boulevard North, according to initial reports.