There are several bridges located in the Cajon Pass that Route 66 passes over. None of them are spectacular, but if you look closely, most have the year that they were built stamped on them.
Scenes of the bridge:
In the Cajon Pass, between the Cleghorn and Kenwood exits in I-15, there are several bridges that the “drive-able” road passes over that were built between 1920 and 1952. Most of the bridges have the years stamped somewhere on the side of the railing.