Highway 99 remains closed northbound after a truck slammed into the 152 Street overpass on Monday.
RCMP Staff Sgt. Mike Ingles said the truck was "clearly" over height and crashed heading north.
The overpass is closed in both directions, with engineers and senior Ministry of Transportation officials on scene assessing the damage.
Traffic is being diverted at 16th Avenue.
Drive B.C. says the estimated time of reopening is 5 a.m. Tuesday.