US Route 310 is a short north-south highway in southern Montana and northern Wyoming.  The northern end is at Interstate 90 in Laurel, Montana, and the southern end is on the west side of Greybull, Wyoming, at a T-intersection with US Routes 14, 16, and 20.  The northernmost segment of the route, around Laurel, which is just west of Billings in Montana, is concurrent with US Route 212.  US Route 310 soon splits from US Route 212 to head south to Greybull, where a length of highway enters the town from each of the four cardinal directions.  US Route 16 and US Route 20 both come from the southern leg and leave on the western leg.  US Route 14 comes from the eastern leg to join the other two US highways west, and US Route 310 is the northern leg.  You might notice that US Route 310 is nowhere near its parent route, US Route 10, from whom it got its number.  That's because US Route 10 was heavily reduced in length during the advent of the Interstate Highway system.  US Route 10 once continued west along Interstate 94 across North Dakota to Billings, and farther west along Interstate 90 through Montana and beyond.  Since US Route 10 is no longer present where its child route still stands, some would call US Route 310 an "orphaned" route.

My photo for US Route 310 is the eastbound junction marker on US Routes 14, 16, and 20, on the western edge of Greybull, Wyoming.  The junction marker announces the upcoming southern end of US Route 310, for traffic heading east. Driving past the southern end of US Route 310 on the way home from Yellowstone National Park, this was the only US Route 310 sign I could find that wasn't a unisign. This photo was taken in August 2018.
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