Idaho State Highway 22

State Highway 22
Route information
Maintained by ITD
Length:	68.606 mi (110.411 km)
Major junctions
From:	US-20 / US-26
	SH-33 SH-28 Clark CR-A-1 Montiview Road
To:	I-15 in Dubois
Location
Counties:	Butte, Clark, Jefferson
Highway system
State Highways in Idaho ← SH-21 SH-24 →

State Highway 22 (SH-22) is a state highway in Idaho from US-20/US-26 and SH-33 to Interstate 15 (I-15) in Dubois.

Route description

SH-22 starts concurrently with SH-33 east of Arco at an intersection with US-20/26 and splits from it about 25 miles (40 km) later. The road travels northeast across the desert before intersecting SH-28 and slowly bending east, passing by some farmland. The highway ends in the city of Dubois at a diamond interchange with I-15.

History

The current SH-22 bears no resemblance to its original configuration. The route of the original SH-22 was based on Sampson Trails G and H from Mountain Home to Trude, which are essentially the route of today's US-20 from Mountain Home through Arco to Idaho Falls and US-26 east from there.

The current configuration is based on the original SH-29 from the 1937 map.

Junction list

County	Location	mi	km	Destinations	Notes
Butte	​	0.000	0.000	US-20 / US-26	Western terminmus and western end of SH-33 overlap
	​	24.670	39.703	SH-33	Eastern end of SH-33 overlap
Clark	​	38.258	61.570	SH-28 – Salmon
	​	41.349	66.545	Reno Point Cut-off Road	shortcut to SH-28
Jefferson	No major junctions
Clark	​	52.749– 53.155	84.891– 85.545	CR-A-1 Montiview Road
	​	68.145	109.669	Small Road	Old US-91
	Dubois	68.460– 68.606	110.176– 110.411	I-15 – Idaho Falls, Butte	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus