Utah State Route 123

For the former highway, see Utah State Route 123 (1931-1933).

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.

State Route 123
SR-123 highlighted in red
Route information
Maintained by UDOT
Length	11.421 mi[1] (18.380 km)
Existed	1931[2] (as SR-124, renumbered in 1933)–present
Major junctions
West end	US 6 / US 191 at Sunnyside Junction
Major intersections	SR-124 in East Carbon
East end	Whitemore Canyon Road in East Carbon
Location
Country	United States
State	Utah
Highway system
Utah State Highway System Interstate US State Minor Scenic
← SR-122 → SR-124

Route description

State Route 123 begins at Sunnyside Junction on US-6/US-191, about 15 miles (24 km) southeast of Price.^[3] 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.^[3]

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^[4] but changed to SR-123 in 1933.^[5] The route was shortened in 1935 by moving the eastern terminus back into Sunnyside,^[6] and splitting off the portion from Sunnyside to Columbia as SR-124.^[7]

Major intersections

The entire route is in Carbon County.

Location	mi[1]	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
	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