Utah State Route 280
|Maintained by UDOT|
|Length:||0.399 mi (0.642 km)|
|Existed:||1961 – present|
|West end:||I‑80 / US‑189 in Coalville|
|East end:||Main Street in Coalville|
State Route 280 is a state highway completely within Summit County in the northern portion of the U.S. state of Utah connecting I-80 in Coalville to Main Street in the same town in a span of 0.39 miles (0.63 km). The entirety of the highway is named 100 South.
The highway begins at a diamond interchange on I-80 at exit 162 west of the center of Coalville and heads northwest on a two-lane undivided highway. SR-280 enters downtown Coalville and terminates on Main Street.
Prior to the construction of I-80, SR-4 (US-189) passed through Coalville on Main Street. To retain access to the town once I-80 replaced the surface road, the State Road Commission designated State Route 280 in 1961 as a short connection between I-80 and Main Street on Icy Springs Road (100 South). Before serving its intended purpose, the road briefly formed part of SR-2 (which had replaced SR-4 in 1962) and US-189, since I-80 was completed west of SR-280 before the portion east to Echo opened. A temporary ramp left the right side of SR-280 where the ramp to I-80 east now begins, and curved left into the westbound lanes of I-80 just before the Interstate crosses under SR-280.
|0.000||0.000||I‑80 to I‑84 – Park City, Ogden, Evanston||Western terminus|
|0.399||0.642||Main Street||Eastern terminus|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi