Northbound I-75 was closed at S. Huron Drive in South Rockwood for a few hours due to a crash involving a flatbed semi.
According to Michigan State Police, troopers are working that crash and Monroe County sheriff's deputies are working another crash along I-75 Downriver.
MSP says the northbound I-75 was shut down at mile marker 26 and it's causing major backups.
The sheriff's deputies worked on a crash along southbound I-75 and I-275, and they had to close down I-275 to land a helicopter for injuries sustained in the crash. Both portions of the highways have been re-opened as of 10:45 a.m.
