Switzer falls

Went hiking Sunday near Switzer falls in the Angeles National Forest. Lots of stream crossings, and this one in particular was guarded by this lizard:

As we got closer, he did some push-ups to warn us off. I crossed first, eventually scaring him off, but he came right back. Here he is standing up to SC:

Not sure what he is. Maybe a Western fence lizard? Apparently the way to tell is to look at their underside.