San Gorgonio Pass
| San Gorgonio Pass | |
|---|---|
A small segment of the San Gorgonio Pass wind farm
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| Elevation | 2,600 ft (792 m) NGVD 29 |
| Traversed by |
 I-10
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| Location | Riverside County, California, United States |
| Range |
San Bernardino Mountains / San Jacinto Mountains |
| Coordinates | 33°55′12.1″N 116°58′14.1″W / 33.920028°N 116.970583°WCoordinates: 33°55′12.1″N 116°58′14.1″W / 33.920028°N 116.970583°W |
| Topo map | Beaumont |
San Gorgonio Pass, sometimes referred to as Banning Pass due to the location of Banning, California at the western end of the pass, el. 2,600 ft (790 m), is a gap on the rim of the Great Basin between the San Bernardino Mountains to the north and the San Jacinto Mountains to the south, carrying Interstate 10 and the Union Pacific Railroad between the Los Angeles basin and the Coachella Valley. Like Cajon Pass to the northwest, it was created by the San Andreas Fault, with the valleys leading up to the pass aligned with the fault. The pass is not as steep as Cajon or Tejon passes, but it is one of the deepest mountain passes in the 48 contiguous states, with the mountains to either side rising almost 9,000 ft (2,700 m) above it. San Gorgonio Mountain, taller but farther away and less visible, is at the northern side of the pass, and Mount San Jacinto is on the southern side. Mount San Jacinto has the fifth-largest rock wall in North America, and its peak is only six miles south of Interstate 10. Today, San Gorgonio Pass is used by commuters from the Greater San Bernardino Area to travel through the mountains to Palm Springs and the Coachella Valley, and points further east, all the way to Phoenix, Arizona.
The pass is the major geologic divide between the igneous batholithic Peninsular Ranges and the Transverse Ranges, which is a massive fault block composed of more diverse forms of rock. According to Yule 2009, the pass is the single "largest discontinuity along the San Andreas fault". Were faulting not to occur, the Peninsular Ranges would have been contiguous with the Sierra Nevada.
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Wikipedia