United States, California, Los Angeles, San Gabriel Mountains: east fork of Chilao Creek, 0.2 miles west of Angeles Crest Hwy., from north end of lower Charlton Flats Picnic Ground to 250 meters north/upstream (Chilao Flat 7.5' Q.) (T3N R11W S34)
34.296389 -118.014167 +-1000m.
34° 17' 47" N 118° 00' 51" W
1536-1585 meters
5040-5200ft.
Canyon bottom, riparian vegetation surrounded by yellow pine & chaparral