A small fenced grassy plot just up from King Harbor marks the site of what was, for two centuries, the most economically important feature on this part of the coast. The Old Salt Lake was a shallow tidal lagoon where seawater evaporated naturally, leaving behind sea salt that the Tongva-Gabrieleño collected for trade, and that the early Spanish and Mexican settlers later harvested commercially.
The lake was drained in the 1880s as the railroad arrived and the area was platted into building lots. A small marker explains the history; otherwise there is nothing to see beyond a patch of grass. Worth a five-minute stop only if you are walking or cycling between King Harbor and Hermosa Beach along the Esplanade route. The interpretive sign references the Tongva and early commercial history that is otherwise invisible in modern Redondo.