The westbound lanes of I-70 in Colorado's high country were closed for several hours Wednesday after a crash involving a semi and a box truck. The lanes were closed at the Eisenhower-Johnson Memorial Tunnels, according to the Colorado Department of Transportation.

The Colorado State Patrol told CBS Colorado that troopers responded to a crash in the westbound lanes at mile marker 212 at 4:18 a.m. All lanes reopened about noon. 

The crash involved a semi-trailer and a box truck. 

One driver was rushed to the hospital by a helicopter ambulance. The other driver claimed no injuries. 

What caused the crash is being investigated. There was a fuel leak with one of the vehicles. 

Troopers said traffic was rerouted on US 6/Loveland Pass. 

There were miles-long backups leading to the tunnel after the crash and closure.