I work for 511 in Oakland California. The 8,600 gallons of unleaded fuel was spread out underneath the overpass and was an open air fire. Meaning it burned as hot as it could without forced air help.

The engineers here state that the steel used in that overpass becomes soft at 1,000 degrees and will melt at 2,800+. The estimate of the fire's temperature was just over 3,000 degrees. Also there was no insulation of any sort around the underside of this overpass. The overpass that the fire was actually burning on was insulated by concrete and asphalt.

The cleanup continues and there will have to be a full inspection of the overpass that remained standing to determine it's structural condition.