San Gorgonio Pass
|San Gorgonio Pass|
A small segment of the San Gorgonio Pass wind farm
|Elevation||1,591 ft (485 m) NGVD 29|
|Traversed by||Interstate 10|
|Location||Riverside County, California, United States|
|Range||San Bernardino Mountains
/ San Jacinto Mountains
San Gorgonio Pass, el. 1,591 ft (485 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 end of the pass, and Mount San Jacinto is at the southern end. 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 batholitic 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.
The summit of the pass is in Beaumont, just east of the junction of Interstate 10 and State Route 60 (former U.S. Route 60), at an elevation of about 2,600 ft (790 m). However, the heart of the pass is generally considered to be further east near Cabazon, where the passageway between the two mountain ranges is narrowest. Eastward from here, the route descends steeply towards the Coachella Valley, with the eastern end of the pass taken to be at the junction of Interstate 10 and State Route 111 near Whitewater Canyon. The Southern Pacific Railroad (now the Union Pacific) laid down tracks through the pass in 1875, and in 1952 an expressway was built through the pass, carrying U.S. Route 99 and U.S. Route 60. There are still portions of the old U.S. 99 route between Whitewater Canyon and Cabazon. Main Street in Cabazon, Ramsey Street in Banning, 6th Street in Beaumont, and Roberts Road in Calimesa are all old sections of U.S. 99.
The San Gorgonio Pass area tends to get snow at least once or twice during the winter months, although it rarely, if ever, sticks to hard surfaces, such as the freeway or city streets. The most famous sight on San Gorgonio Pass is the San Gorgonio Pass Wind Farm on its eastern slope, as it marks the gateway into the Coachella Valley. (The pass is one of the windiest places in Southern California.) Also nearby are the Cabazon Dinosaurs on the north side of the freeway from Cabazon.
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