Northbound I-25 was closed most of Thursday morning due to the crash of a milk tanker.
The crash happened at I-25 and Cimarron just before 4:30 a.m. The left two lanes of the interstate re-opened at around 11:30 a.m., and the right lane re-opened shortly after.
According to officials, the tanker leaked fuel and milk onto the highway.
Hazmat crews were on the scene. Firefighters were concerned that the fuel or milk could contaminate Fountain Creek.
It took tow truck crews hours just to get the tanker upright. They were having trouble because of the weight of the milk that was still in the tanker.
Colorado Department of Transportation crews put sand on the milk that was frozen on the road.
Police said the driver of the truck was taken to the hospital with life-threatening injuries. He was the only person injured in the crash.
According to officers, street lights were out in the section of I-25 where the crash happened and that may have contributed to the accident.
Police said copper thieves stole copper from those lights and they were not repaired.