This is one of the oldest bridge locations in Los Angeles County. The Macy Street Bridge over the Los Angeles River, just two blocks west, is the oldest bridge location (built in the early 1870's) and the only covered wooden bridge ever built in Los Angeles County. This bridge was a continuation of that bridge but was originally built over a stream bed (Arroyo De Los Posos) which was later dug up and turned into a railroad right ofway with train tracks. However in the early 1930's most of the tracks were condemned and converted into Ramona Blvd, a mulit-lane limited access street that was a sort of proto-freeway. In the 1950's most of Ramona Blvd was overlaid with the San Bernadino Freeway (Interstate 10), although the carpool lane is pretty much the same street as Ramona for part of the way. Some of the tracks are still there and are used by commuter trains (Metrolink). The Macy Street (now César Chávez Blvd) Bridge still spans the same gap, linking DTLA with Boyle Heights and East Los Angeles, whether a gully, train trackss, Ramona Blvd, or "The Ten".
Bridge over San Bernadino Freeway (Interstate 10) on Cesar Chavez Ave. in Boyle Heights, Los Angeles,