( CNN ) -- Traffic on Interstate 15 in Southern California was backed up for miles early Tuesday after a new overpass in the city of Hesperia caught fire , a fire official said . The major artery between Los Angeles and Las Vegas is expected to be closed for up to 48 hours while crews put out the fire and demolish the damaged structure , according to Eric Sherwin with the San Bernadino County Fire Department . The bridge caught fire Monday when sparks from blowtorches used to cut reinforcing bar ignited the wooden framework supporting the structure . Hesperia is about 60 miles northeast of Los Angeles . College tour in California ends in fiery wreck , leaves 10 dead .
Interstate 15 is shut down between Los Angeles and Las Vegas . A new overpass caught fire in Hesperia , California . Blowtorches ignited the wooden deck under the bridge .