Or, at least, it used to be. Now that I-70 cuts through the Swell, the secret is out. The San Rafael Swell is a large geologic feature located in south-central Utah, west of Green River, Utah. Approximately 40 miles by 75 miles (64 km by 121 km), the Swell is a giant dome-shaped anticline of sandstone, shale, and limestone that was pushed up during the Laramide Orogeny 60-40 million years ago, about the same time the Rocky Mountains and area monoclines were created.
A rancher, referring to the crack in San Rafael Reef where I-70 passes through it (1st banner photo), said that before the blasting opened it up for the highway he could
stand in that slot canyon and touch both walls by extending my arms.
I-70 through San Rafael Swell is unique in several ways. It charted new territory, going where no roads existed; it is the largest segment of interstate opened at once; and the 110 mile segment between Salina and Green River is the longest stretch of interstate with no services.
This article doesn't begin to scratch the surface of the rugged beauty and geology of the Swell - petroglyphs, a dinosaur quarry, canyons and slot canyons, rock formations, wilderness and primitive areas, etc. However, if you have stopped at any of the I-70 pullovers in the Swell (seven, if I counted correctly), no further explanation is necessary - the rugged beauty and scenic vistas speak for themselves.
San Rafael Swell photos are divided into four sections:
San Rafael Reef runs along the eastern edge of the Swell; Goblin Valley State Park is on the southeast edge of the Swell; Muddy Creek is an ancient 100 mile long waterway predating the formation of the Swell that begins on the eastern slopes of the
Wasatch Plateau at elevations above 10,500 feet (3,200 m) and cuts a path completely across the Swell, with a popular section called
the Chute - at its confluence with the Dirty Devil it has dropped 6,000 feet (1,825 m) in elevation; and Canyons highlights a few of the spectacular canyons in the Swell.
The Photo Gallery presents photos for individual viewing.
The Auto Shows menu has a QuickTour of six selected photos, auto-shows of the photos of each of the four sections, and All Photos with all of the San Rafael Swell photos.
Explore Map is a large pdf map to explore the Swell.
The Google Earth Sat[ellite] View gives an aerial view of this huge anticline. The geology of, more information about, and more photos of Goblin Valley State Park, including the Goblin's Lair - the
Chamber of the Basilisk, is in our Utah State Parks/Goblin Valley State Park article.