U.S. Route 40 in Utah
|Maintained by UDOT|
|Length:||174.624 mi (281.030 km)|
|Existed:||1926 – present|
|West end:||I-80 at Silver Creek Junction (north of Park City)|
| US-189 in Heber City
US-191 in Duchesne
US-191 in Vernal
|East end:||US 40 at the Colorado state line (west of Dinosaur, CO)|
The west end of U.S. Route 40 is in the U.S. state of Utah at Silver Creek Junction (about 20.7 miles (33.3 km) east of Salt Lake City) with Interstate 80. From there it heads southeast through Heber City and east into Colorado on its way to the Mid-Atlantic.
Route description 
|This section requires expansion. (September 2011)|
U.S. Route 40 begins at I-80 at Silver Creek Junction in a broad valley northeast of Park City and travels south-southeast as a full freeway. At the south end of the valley, Jordanelle Reservoir comes into view and US-40 continues south high on the slope above its western shore while Utah State Route 248 climbs away to the east on the slope overlooking the northern shore. The freeway passes through several large cuttings in the side of the mountains that were dug when US-40 was relocated to make way for the reservoir; Utah State Route 319 provides access down the slope to a state park on the shore of the reservoir. South of the reservoir, the dam is visible on the left and the road loses elevation quickly before abruptly connecting to a (suburban or exurban) non-freeway segment with frequent curb cuts and building frontage. In central Heber, U.S. Highway 189 continues south, but US-40 turns east to leave the city. US-40 continues south and east through mountains and the Uintah Basin to the Colorado border near Dinosaur National Monument.
As with most states, US-40 follows the Victory Highway through Utah. This auto trail was organized in 1921, and overlapped the older Lincoln Highway through Salt Lake City. To the west, it split from the Lincoln at Mills Junction, and took a straight path across the Great Salt Lake Desert on the proposed Wendover Cut-off to Nevada. The east split with the Lincoln was at Kimball Junction, where the Victory turned to the southeast over an old trail that led past Heber City, over Daniel's Pass, and along the Strawberry River and Duchesne River to Fort Robidoux. The highway continued east across a relatively flat area through Vernal to Colorado.
The Utah State Road Commission took over the highway from Kimball Junction to Colorado in 1910 and 1911; in late 1926, the American Association of State Highway Officials (AASHO) assigned US-40 to this cross-state route.
The old Lincoln Highway east of Kimball Junction was initially US-530, but in the late 1930s it became part of US-189. The split between US-40 and US-189, formerly the junction of the Victory and Lincoln Highways, was moved east from Kimball Junction to Silver Creek Junction in 1952; this change moved both routes to a new road between Keetley Junction and Silver Creek Junction, and renumbered the road between Kimball and Silver Creek Junctions from US-189 to US-40. The old road between Keetley and Kimball Junctions became State Route 248. In 1974, with its replacement - Interstate 80 - almost complete across California, Nevada, and Utah, the three states applied to AASHO to truncate US-40 to Silver Creek Junction. (US-40 had been removed west of Truckee, California in 1964.) AASHO approved the truncation on June 17, 1975.
|This section requires expansion. (May 2008)|
Major intersections 
|Summit||Silver Creek Junction||0.000||I-80 west – Salt Lake||Westbound exit and eastbound entrance|
|0.000||1||I-80 east (US-189 north) / Silver Creek Road – Cheyenne||Westbound exit and eastbound entrance|
|3.998||4||Park City, Kamas (SR-248)|
|East end of freeway|
|13.248||SR-32 – Francis, Kamas, Midway|
|Heber City||17.006||SR-113 (100 South)|
|17.945||US-189 south – Orem, Provo||East end of US-189 overlap|
|86.434||US-191 south (100 West)||West end of US-191 overlap|
|86.524||SR-87 (Center Street)|
|Roosevelt||114.576||SR-121 (200 North)|
|Vernal||143.787||SR-121 (500 West)|
|144.285||US-191 north (Vernal Avenue) – Flaming Gorge, Rock Springs||East end of US-191 overlap|
|Naples||148.242||SR-45 – Bonanza|
|157.109||SR-149 – Dinosaur National Monument|
|174.624||Colorado state line|
- Utah Department of Transportation, Highway Reference Information: PDF (128 KB), updated May 2008, accessed June 2008
- Froiseth, B.A.M., Map of the Territory of Utah, 1870
- Rand McNally Auto Road Atlas, 1926, accessed via the Broer Map Library
- United States System of Highways, November 11, 1926
- Utah Department of Transportation, Route 6 history, updated September 2005
- Utah Department of Transportation, Route 248 history, updated December 2005
- Utah Department of Transportation, Route 40 history, updated October 2005
- "Designation of State Roads", Chapter 45, Session Laws of Utah, 1953: "Route 252. From route 6 west of Myton via Myton Main Street to route 6."
- Utah Department of Transportation, Highway Resolutions: PDF (2.54 MB), updated November 2007, accessed May 2008
|U.S. Route 40|