View source for U.S. Route 310

{{short description|Highway in the United States}}
{{Use American English|date=April 2025}}
{{Use mdy dates|date=September 2023}}
{{Infobox road
|country=USA
|type=US
|route=310
|map={{maplink-road|from=U.S. Route 310.map}}
|map_custom=yes
|map_notes=US&nbsp;310 highlighted in red
|length_mi=102.57
|length_ref=<ref group=lower-alpha>Mileage is a summation of each state's length</ref>
|length_notes={{convert|47.93|mi|abbr=on}} in Wyoming<ref name="WYDOT">{{cite web|url=http://www.dot.state.wy.us/files/content/sites/wydot/files/shared/Planning/Reference%20Marker%20Book.pdf|title=Reference Marker Book|date=November 2004|publisher=[[Wyoming Department of Transportation]]|access-date=April 12, 2012}}</ref><br>{{convert|54.646|mi|abbr=on}} in Montana<ref name="MDT">{{cite web|url=http://www.mdt.mt.gov/publications/docs/brochures/2011_roadlog.pdf|title=Montana Road Log|year=2011|publisher=[[Montana Department of Transportation]]|access-date=April 12, 2012}}</ref>
|established=1926
|direction_a=South
|direction_b=North
|terminus_a={{Jct|state=WY|US|14|US|16|US|20|WY|789}} in [[Greybull, Wyoming|Greybull, WY]]
|junction=
*{{Jct|state=MT|US|212}} in [[Rockvale, Montana|Rockvale, MT]]
*{{Jct|state=MT|I|90}} in [[Laurel, Montana|Laurel, MT]]
|terminus_b={{Jct|state=MT|BL|90|dab1=Laurel|Sec|532}} in Laurel, MT
|states=[[Wyoming]], [[Montana]]
|counties='''WY:''' [[Big Horn County, Wyoming|Big Horn]], [[Park County, Wyoming|Park]]<br>'''MT:''' [[Carbon County, Montana|Carbon]], [[Yellowstone County, Montana|Yellowstone]]
|spur_of=10
|spur_type=US
}}

'''U.S. Route 310''' ('''US&nbsp;310''') is a spur of historic [[U.S. Route 10]], now [[Interstate 90]].  It runs for {{convert|108|mi|km}} from [[Laurel, Montana]], to [[Greybull, Wyoming]].  It passes through the states of [[Montana]] and [[Wyoming]].  Near the town of [[Lovell, Wyoming]], US&nbsp;310 is [[concurrent (road)|concurrent]] with [[U.S. Route 14 Alternate (Wyoming)|US&nbsp;14A]] for approximately {{convert|3|mi|km}}.

==Route description==
US 310 starts at a junction with [[US 14 (WY)|US 14]], [[US 16 (WY)|US 16]], and [[US 20 (WY)|US 20]] west of [[Greybull, Wyoming|Greybull]]; [[Highway 789 (Wyoming)|Highway 789]] continues north along US 310 through the desert. Near the town of [[Lovell, Wyoming|Lovell]], US 310 passes by Lovell Lakes before turning west through a brief stretch of farmland that extends into [[Cowley, Wyoming|Cowley]]. From Cowley, the highway runs west to [[Deaver, Wyoming|Deaver]], then due north to [[Frannie, Wyoming|Frannie]], where it straddles the boundary between [[Big Horn County, Wyoming|Big Horn County]] and [[Park County, Wyoming|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, Montana|Bridger]] and [[Fromberg, Montana|Fromberg]] before running concurrently with [[US 212 (MT)|US 212]]. The highway enters the city of [[Laurel, Montana|Laurel]], where US 212 continues onto [[I-90 (MT)|I-90]], and US 310 ends at Main Street.<ref>{{google maps|url=https://maps.google.com/maps?q=Laurel,+MT&hl=en&ll=45.356005,-108.369141&spn=2.115307,4.905396&sll=46.468133,-116.575928&sspn=4.146769,9.810791&oq=laurel,+&t=h&hnear=Laurel,+Yellowstone,+Montana&z=8|title=US 310|access-date=December 23, 2013}}</ref>

==History==
Historically, US&nbsp;310 intersected with US&nbsp;10 at [[Laurel, Montana|Laurel]].  After 1986, when US&nbsp;10 was decommissioned west of [[West Fargo, North Dakota]], US&nbsp;310 no longer connected to its "parent" route.

==Major intersections==
{{Jcttop|state_col=state|length_ref=}}
{{WYint
|sspan=7
|county=Big Horn
|cspan=6
|location=none
|type=concur
|mile=0.00
|road={{Jct|state=WY|US|14|US|16|US|20|WY|789|dir4=South|city1=Greybull|city2=Cody|location3=[[Yellowstone National Park|Yellowstone]]}}
|notes=South end of WYO 789 overlap
}}
{{WYint
|location=Lovell
|lspan=2
|type=concur
|mile=27.03
|road={{Jct|state=WY|US|14A|dir1=East|city1=Burgess Junction}}
|notes=South end of US 14A overlap
}}
{{WYint
|mile=28.77
|road={{Jct|state=WY|WY|32|city1=Emblem}}
}}
{{WYint
|location=none
|type=concur
|mile=30.23
|road={{Jct|state=WY|US|14A|dir1=West|city1=Byron|city2=Powell|city3=Cody}}
|notes=North end of US 14A overlap
}}
{{WYint
|location=Cowley
|mile=34.16
|road={{Jct|state=WY|WY|35|CR|R7}}
}}
{{WYint
|location=Deaver
|mile=40.14
|road={{Jct|state=WY|WY|114|city1=Garland|city2=Powell|city3=Cody}}
}}
{{Jctco|state=WY|county=Park|location=Frannie}} 
{{Jctplace
|river=&nbsp;
|river_wide=yes
|type=concur
|mile=47.93
|mile2=0.000
|line=yes
|place=Wyoming–Montana state line; <span class="nowrap">[[Wyoming Highway 789|WYO&nbsp;789]]</span> ends
}}
{{MTint
|sspan=4
|county=Carbon
|cspan=2
|location=Bridger
|mile=24.700
|road={{Jct|state=MT|MT|72|city1=Belfry|location2=[[Cody, Wyoming|Cody]]}}
}}
{{MTint
|location=Rockvale
|type=concur
|mile=42.628
|road={{Jct|state=MT|US|212|dir1=West|city1=Red Lodge}}
|notes=South end of US 212 overlap
}}
{{MTint
|county=Yellowstone
|cspan=2
|location=Laurel
|lspan=2
|type=concur
|mile=54.154
|road={{Jct|state=MT|I|90|US|212|dir2=East|city1=Billings|city2=Butte}}
|notes=North end of US 212 overlap
}}
{{MTint
|mile=54.646
|road={{Jct|state=MT|BL|90|dab1=Laurel|name1=Main Street|Sec|532}}
}}
{{jctbtm|keys=concur|col=7}}

==Notes==
{{reflist|group=lower-alpha}}

==References==
{{Attached KML|display=title,inline}}
{{Commons category}}
{{Reflist}}

==External links==
* [http://usends.com/310.html Endpoints of U.S. Highway 310]

{{US 10}}
{{start srbox}}
{{mt browse|previous_type=MT|previous_route=287|route=[[List of Montana numbered highways|MT]]|next_type=US|next_route=312}}
{{wy browse|previous_type=WY|previous_route=296|route=[[State highways in Wyoming|WY]]|next_type=WY|next_route=310}}
{{s-end}}

{{DEFAULTSORT:10-3}}
[[Category:United States Numbered Highway System|10-3]]
[[Category:U.S. Highways in Montana|10-3]]
[[Category:U.S. Highways in Wyoming|10-3]]
[[Category:U.S. Route 10|3]]
[[Category:Transportation in Big Horn County, Wyoming|U.S. Route 310]]
[[Category:Transportation in Park County, Wyoming|U.S. Route 310]]
[[Category:Transportation in Carbon County, Montana|U.S. Route 310]]
[[Category:Transportation in Yellowstone County, Montana|U.S. Route 310]]
[[Category:1926 establishments in Montana]]
[[Category:1926 establishments in Wyoming]]