U.S. Route 420

U.S. Highway 14
US 14 highlighted in solid red and US 14A highlighted in dashed red
Route information
Maintained by WYDOT
Length:	449.21 mi (722.93 km)
Existed:	1936 – present
Major junctions
West end:	US 16 / US 20 at Yellowstone National Park
	US 14A in Cody US 310 in Greybull US 16 / US 20 in Greybull US 14A near Dayton I-90 / US 87 in Ranchester I-90 / US 87 in Sheridan US 16 near Clearmont I-90 in Gillette I-90 / US 16 in Moorcroft I-90 in Sundance
East end:	I-90 / US 14 at the South Dakota state line
Highway system
United States Numbered Highway System List Special Divided Replaced State highways in Wyoming Interstate U.S. State ← WYO 13 WYO 14 →

State highways in Wyoming

In the U.S. state of Wyoming, U.S. Highway 14 (US 14) runs east to west across the northern part of the state. The road connects South Dakota on the east with Yellowstone National Park on the west. It is mostly a two lane surface road except for several sections that it shares with Interstate 90.

While the official western terminus of the road is at the Eastern gate of Yellowstone National Park there is an unsigned section within the park itself starting at a junction with U.S. Route 89 and U.S. Route 287 at West Thumb and following the northern shore of Yellowstone Lake. From the park US 14 is co-signed with U.S. Route 16 and U.S. Route 20. The roads lead east out of the Absaroka Range and down the Shoshone River valley to Cody. Here, U.S. Route 14 Alternate (US 14A) splits north toward Powell, while US 14/16/20 continues east across the Bighorn Basin to Greybull. At Greybull, US 16 and US 20 go south, while US 14 travels east to Shell, and the western slope of the Big Horn Mountains. The road ascends a windy path through steep Shell Canyon and rejoins US 14A at the top of the range at Burgess Junction. The road is designated as Bighorn Scenic Byway between Shell and Dayton on the eastern side of the mountain range. On the east side of the Bighorns, the road merges with Interstate 90 and travels southeast to Sheridan, Wyoming. From Sheridan, the road continues east, rejoining with US Route 16 near Clearmont. The roads travel across the Powder River Country to Gillette, Wyoming where it joins again with Interstate 90 to Moorcroft. From here, it diverges north from Interstate 90 briefly to junction with Wyoming Highway 24 with access to Devils Tower National Monument. US 14 turns south and rejoins Interstate 90 which it follows to the eastern border of Wyoming and South Dakota.