Take the Mt Baldy exit off the I-10 about an hour east of Los Angeles then follow the road up to the end of town. Park and It's a 7 mile hike up to Cucamonga Peak following this stream the first third of the way.
Pack light if you do the hike. The elevation change is around 4700 ft
While hiking up to the Cucamonga Peak I had to take a moment to capture the stunning color of yellow and orange leaves against the blue green water. Shortly after this photo was taken it started snowing.