Rolled semi hauling ammonia shuts down Colo. 52 near Prospect Valley

Published on May 11, 2022


A semi tanker truck hauling anhydrous ammonia rolled on its side early this morning causing Colo. 52 to be shut down for several hours at Colo. 79 near Prospect Valley.

Weld County Sheriff’s Office deputies responded about 2 a.m. to the report of the rolled semi. They were joined by local firefighters from the Southeast Weld Fire Protection District and Colorado State Patrol’s Hazmat team.

Deputies closed the roadway while state Hazmat technicians inspected the tanker, which had remained intact. A 1/2-mile shelter in place order was issued while the anhydrous ammonia, a type of nitrogen fertilizer, was offloaded.

Heavy tow wreckers were used to upright the semi and trailer to clear the roadway. Hazmat technicians cleaned a minor diesel spill from the semi’s fuel tank.

No serious injuries were reported.

Anyone with information regarding this or any other crime is asked to call the Weld County Sheriff’s Office at (970) 356-4015 or Northern Colorado Crime Stoppers at 1-800-222-TIPS (8477). Tips can also be submitted through the Crime Stoppers website at Those submitting tips through Crime Stoppers that lead to the arrest and filing of charges on a suspect(s) may be eligible for a cash reward.