Idaho State Highway 22

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State Highway 22 marker

State Highway 22
Route information
Maintained by ITD
Length 43.936 mi[1] (70.708 km)
Major junctions
South end SH 33 near Howe
  SH 28 near Blue Dome
North end I-15 in Dubois
Counties Butte, Clark, Jefferson
Highway system
SH 21SH 24

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

Route description[edit]

SH-22 begins at SH-33 near Arco and 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.[1][2]


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,[3] 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.[4]

Junction list[edit]

Butte0.0000.000 SH 33Eastern end of SH-33 overlap
Clark13.58821.868 SH 28 – Salmon
No major junctions
Clark43.47869.971Small RoadOld US-91
Dubois43.93670.708 I-15 – Idaho Falls, ButteI-15 exit 167; eastern terminus.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Google

KML is from Wikidata
  1. ^ a b c Idaho Transportation Department (January 2, 2016). "State Highway 22 Milepoint Log" (PDF). Idaho Transportation Department. Retrieved February 15, 2017. 
  2. ^ Google (20 July 2012). "State Highway 22" (Map). Google Maps. Google. Retrieved 20 July 2012. 
  3. ^ List of state highways in Idaho#History
  4. ^ Rand McNally and Company, Road map: Idaho, Mont., Wyo., published by Texaco, 1937