UPDATE at 7:00 p.m. Sig Alert extended another 4 hours.
According to the California Highway Patrol Log, the big rig load is approximated 60,000 lbs of cement.
Earlier.
The westbound transition road from the San Bernardino (10) Freeway to the southbound San Gabriel River (605) Freeway in Baldwin Park will be closed for several hours because of a single-vehicle crash that left a big rig overturned, says Officer Christian Cracraft.
Traffic is being diverted to the northbound San Gabriel River Freeway, he says.
