Western Utah is a region of Utah encompassing the counties of Box Elder and Tooele, as well as the western halves of the counties of Juab, Millard, and Beaver (west of longitude 113W).
Western Utah is covered with gigantic expanses of flat desert, punctuated by sudden, forested mountains. Its larger towns are all located in the extreme east of the region, near the more populated regions of Wasatch Front and Central Utah. Much of the region is off limits to the curious and the adventurous, as it is home to the Dugway Proving Grounds, an enormous military area which has been the object of not a few conspiracy/UFO theories. Travelers who do make it out to the far western desert will be rewarded mostly with solitude, but also some extreme (and potentially dangerous) desert wilderness backpacking opportunities. Note that at only 60 miles from Salt Lake City you are likely to only encounter sage brush covered desert or trail heads leading into the mountains. A tamer outdoors experience can be had at the region's most popular attraction, the Deseret Wilderness Area.
The two "main" desert roads heading into the remote west are US-6 from Delta and US-29 from Milford. They mostly just serve to take you further into nowhere, but you will be rewarded with some impressive, if monotonous, desert vistas. US-6, if you follow it far enough, will eventually get you to Great Basin National Park in Nevada.
The Spiral Jetty : From Wikipedia, the free encyclopedia
The Spiral Jetty, considered to be the central work of American sculptor Robert Smithson, is an earthwork sculpture constructed in 1970.
Built entirely of mud, salt crystals, basalt rocks, earth, and water on the northeastern shore of the Great Salt Lake near Rozel Point in Utah, it forms a 1,500-foot-long (460 m), 15-foot-wide (4.6 m) counterclockwise coil jutting from the shore of the lake which is only visible when the level of the Great Salt Lake falls below an elevation of 4,197.8 feet (1,279.5 m). At the time of its construction, the water level of the lake was unusually low because of a drought. Within a few years, the water level returned to normal and submerged the jetty for the next three decades. Due to a drought, the jetty re-emerged in 2004 and was completely exposed for almost a year. The lake level rose again during the spring of 2005 due to a near record-setting snowpack in the mountains and partially submerged the Jetty again. Lake levels receded and, in the spring of 2010, the Jetty was again walkable and visible. As of late June 2011, runoff from record snowpack has all but completely submerged the Jetty. Originally black basalt rock against ruddy water, it is now largely white against pink due to salt encrustation and lower water levels.
The Jetty is *extremely* far from most human habitation. It is located 17 miles by dirt road, through active pasturelands, from the Golden Spike National Historic Site, which is itself ~32 (paved) miles from the nearest town of Corrine, Utah. Ensure you will have gas enough for the ~100 mile roundtrip, and time enough to be back on paved roads before dark.
In poor weather conditions it can be extremely dangerous to attempt to visit the Spiral Jetty as even though there are signs directing you to the jetty, it would be very easy to get lost if they are missed due to poor visivbility. An accident with the cattle that are often found on the road would leave you not only stranded, but liable for the damages to the livestock.
The Spiral itself will most likely be partially or fully submerged when you arrive, although a climb up the nearby hills can provide a better vantage point from which the jetty can be seen even if it is underwater.
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Do not head far out into the desert without reserve water and gasoline. Expect to need a gallon of water per day per person in the event that an emergency situation develops.