Cajon Pass! I'm from the east coast but my Grandfather years ago remarried and settled in Upland, CA not far from Cajon Pass. They also owned a home in Arizona across the river from Needles. I was fortunate to have spent quite a bit of my early adult life visiting there and the many trips through the Pass going to and from the River.Sure looks like it could be.
Many great memories of boating and drinking on the river in the mid 70s.