title: Utah State Route 123
text: # Utah State Route 123
  
  Utah State Route 123 (SR-123) is a state highway in the U.S. state of Utah. Spanning 11.4 miles (18.3 km), it connects the city of East Carbon with US-6 / US-191 in Carbon County.
  
  ## Route description
  
  State Route 123 begins at Sunnyside Junction on US-6/US-191, about 15 miles (24 km) southeast of Price. It heads east, passing through East Carbon-Sunnyside at the base of the Book Cliffs. It turns to the northeast and terminates shortly after it enters Whitmore Canyon.
  
  ## History
  
  The road from Sunnyside Junction through Sunnyside to Columbia (now all part of East Carbon-Sunnyside) was added to the state highway system in 1931, initially numbered SR-124 but changed to SR-123 in 1933. The route was shortened in 1935 by moving the eastern terminus back into Sunnyside, and splitting off the portion from Sunnyside to Columbia as SR-124.
  
  ## Major intersections
  
  The entire route is in Carbon County.
  
  | Location | mi | km | Destinations | Notes |
  | - | - | - | - | - |
  | Sunnyside Junction | 0.000 | 0.000 | US 6 / US 191 – Price, I-70 | Western terminus |
  | East Carbon | 8.694 | 13.992 | SR-124 – Horse Canyon | |
  | East Carbon | 11.421 | 18.380 | "End State Maintenance" sign — Whitemore Canyon Road | Eastern terminus |
  | 1.000 mi = 1.609 km; 1.000 km = 0.621 mi |||||
  