U.S. Route 310

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U.S. Route 310 marker

U.S. Route 310
US 310 highlighted in red
Route information
Auxiliary route of US 10
Length102.57 mi[a] (165.07 km)
47.93 mi (77.14 km) in Wyoming[1]
54.646 mi (87.944 km) in Montana[2]
Major junctions
South end US 14 / US 16 / US 20 / WYO 789 in Greybull, WY
North end I-90 Bus. / S-532 in Laurel, MT
StatesWyoming, Montana
CountiesWY: Big Horn, Park
MT: Carbon, Yellowstone
Highway system

U.S. Route 310 (US 310) is a spur of U.S. Route 10. It runs for 108 miles (174 km) from Laurel, Montana, to Greybull, Wyoming. It passes through the states of Montana and Wyoming. Near the town of Lovell, Wyoming, US 310 is concurrent with US 14A for approximately 3 miles (4.8 km).

Route description[edit]

US 310 starts at a junction with US 14, US 16, and US 20 west of Greybull; Highway 789 continues north along US 310 through the desert. Near the town of Lovell, US 310 passes by Lovell Lakes before turning west through a brief stretch of farmland that extends into Cowley. From Cowley, the highway runs west to Deaver, then due north to Frannie, where it straddles the boundary between Big Horn County and Park County. Just to the north of Frannie, US 310 bends slightly to the west, so that the road is actually inside Park County by about 400 feet before reaching the Montana state line. At the state line, Wyoming Highway 789 ends and US 310 continues northwest into the desert. At the junction with Montana Highway 72, US 310 turns north, passing through farmland and the towns of Bridger and Fromberg before running concurrently with US 212. The highway enters the city of Laurel, where US 212 continues onto I-90, and US 310 ends at Main Street.[3]


Historically, US 310 intersected with US 10 at Laurel. After 1986, when US 10 was decommissioned west of West Fargo, North Dakota, US 310 no longer connected to its "parent" route.

Major intersections[edit]

WyomingBig HornGreybull0.000.00 US 14 / US 16 / US 20 / WYO 789 southSouth end of WYO 789 overlap
Lovell27.0343.50 US 14A eastSouth end of US 14A overlap
28.7746.30 WYO 32 south
30.2348.65 US 14A westNorth end of US 14A overlap
Cowley34.1654.98 WYO 35 south
Deaver40.1464.60 WYO 114 west
No major junctions
Wyoming–Montana state line; WYO 789 ends
MontanaCarbonBridger24.70039.751 MT 72 south
Rockvale42.62868.603 US 212 westSouth end of US 212 overlap
YellowstoneLaurel54.15487.152 I-90 / US 212 eastNorth end of US 212 overlap
54.64687.944 I-90 Bus. (Main Street) / S-532
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ Mileage is a summation of each state's length


Route map:

KML is from Wikidata
  1. ^ "Reference Marker Book" (PDF). Wyoming Department of Transportation. November 2004. Retrieved 12 April 2012.
  2. ^ "Montana Road Log" (PDF). Montana Department of Transportation. 2011. Retrieved 12 April 2012.
  3. ^ Google (23 December 2013). "US 310" (Map). Google Maps. Google. Retrieved 23 December 2013.

External links[edit]

Browse numbered routes
US 287MTUS 312
WYO 296WYWYO 310