Utah State Route 122

SR-122 begins at the east right-of-way line of the Utah Railway, opposite the coal mine and ghost town of Hiawatha in the Manti-La Sal National Forest. It heads east in generally straight lines, gradually descending a ridge from the foothills of Gentry Mountain into the Castle Valley. About two-thirds of the way to the end at SR-10, SR-122 meets a county road from Wattis, another former mining town.[2]

A pair of roads connecting the coal mining company town of Hiawatha with SR-10 was added to the state highway system in 1931, initially numbered SR-123[3] but changed to State Route 122 in 1933.[4] One branch headed east along present SR-122; the other turned south at Hiawatha Junction (just east of the Utah Railway crossing) and passed east of Mohrland to end at SR-10 near Huntington. The latter branch was split off as State Route 236 in 1945[5] and removed from the state highway system in 1969.[6] Another branch, running southeast from Wattis to SR-122, became State Route 50 in 1935[7] and was also deleted in 1969.[8] A short truncation was made to SR-122 at its west end in 1993, after Hiawatha was disincorporated, so that the U.S. Fuel Company could gate the former Main Street. The end was moved from near a curve on Main Street north of Center Street to the east right-of-way line at the railroad crossing.[9]

The entire route is in Carbon County.

Location	mi[1]	km	Destinations	Notes
Hiawatha	0.000	0.000	Mohrland Road (former SR-236 – Huntington)	Western terminus
​	5.903	9.500	Former SR-50 – Wattis
	8.751	14.083	SR-10	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi