U.S. Route 310

U.S. Route 310
U.S. Route 310
	US 310 highlighted in red
Route information
	Auxiliary route of US 10
Length	107.548 mi (173.082 km) 52.902 mi (85.138 km) in Wyoming; 54.646 mi (87.944 km) in Montana
Existed	1926–present
Major junctions
South end	US 14 / US 16 / US 20 / WYO 789 in Greybull, WY
	US 212 in Rockvale, MT; I-90 in Laurel, MT;
North end	I-90 BL / S-532 in Laurel, MT
Location
Country	United States
States	Wyoming, Montana
Counties	WY: Big Horn, Park; MT: Carbon, Yellowstone
Highway system
	United States Numbered Highway System; List; Special; Divided;

U.S. Route 310 (US 310) is a spur of historic U.S. Route 10, now Interstate 90. It runs for 108 miles (174 km) from Greybull, Wyoming to Laurel, Montana. It passes through the states of Montana and Wyoming. US 310 is concurrent with Wyoming Highway 789 for its entirety through Wyoming, along with US 14A for approximately 3 miles (4.8 km) near Lovell, Wyoming.