PAULS VALLEY, Okla. (KXII) - Pauls Valley police say it happened just before 4.
The truck was traveling under the overpass near I-35 and highway 19.
Police say the permit for the tank showed it as 13 feet and 6 inches, and the bridge is 15 feet 10 inches.
They tell us a valve that was sitting on top of the tank hit the overpass.
The Oklahoma Department of Transportation will assess the bridge for damages.
No one was hurt.