Idaho State Highway 22
# Idaho State Highway 22

State Highway 22 (SH-22) is a 43.936-mile-long (70.708 km) state highway in Idaho from SH-33 to Interstate 15 (I-15) in Dubois.

## Route description

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.

## 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 | SH-33 | Eastern end of SH-33 overlap |
| Clark | ​ | 13.588 | 21.868 | SH-28 – Salmon | |
| Jefferson | No major junctions | No major junctions | No major junctions | No major junctions | No major junctions |
| Clark | ​ | 43.478 | 69.971 | Small Road | Old US 91 |
| Clark | Dubois | 43.936 | 70.708 | I-15 – Idaho Falls, Butte | I-15 exit 167; eastern terminus. |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus ||||||
