Police in the town of Industry say the 49-year-old man was standing by a tree hit when he was struck by a bolt of lightning at about 8:30 p.m. Saturday.
Industry officer Aaron Lopez says the man and others were moving scouts and camping supplies off the site as a thunderstorm approached.
Lopez says no children were nearby when the man was struck. The man was up and walking around when police arrived, though he was treated later at a hospital for a wound where the lightning bolt apparently exited his body.
Police are not identifying the man.