We did a car-camping trip down to Central California last week: spent a night on the shore of Lake Nacimiento on the Monterey-San Luis Obispo county border, then a couple nights at Wheeler Springs, a National Forest campground on Highway 33 a few miles north of Ojai in Ventura County.
The second night at Wheeler, while we got ready to go to bed, the individual above landed on a towel on our picnic table. He tolerated lots of picture taking and stayed on the towel when I carried it into our tent's front vestibule (he/she flew off, eventually). I'd say the wingspan was an inch and a half or two inches.
Thanks to the excellent iNaturalist site, I've got an identification for the creature: Tetracis cervinaria (Tetracis are also called "slant line" moths, it appears). This one's a native, seen up and down the West Coast from Southern California (Ventura County is near the southern limit of its range, apparently) up to British Columbia and east to the Rocky Mountains.
In looking and photographing a few moths and butterflies, it's always surprising to me to see how much there is to the organism beyond the wings. In the case of moths, big hairy bodies. I said this guy (or whatever) was tolerant of my picture taking. I happened to have a headlamp on and used it to light up the moth as I shot it from different angles. When I shone the light directly into its eyes, I expected it to react. It didn't appear to, though if you're in an anthropomorphizing mood its stare looks a little baleful.