| Arco to Challis or Challis to Salmon |
| Beeches Corner to Junction, SH-26B |
| Between District Line and Broadway Interchange |
| Between Idaho Falls & Roberts |
| Dubois to Montana Line |
| Junction SH-22 to Junction of SH-28 |
| Junction SH-28 to Sage Junction |
| Junction US-20 to Junction of SH-22 |
| Junction US-20 to Teton |
| Rexburg to Sugar City |
| Ririe to SH-31 |
| Roberts to Sage Junction |
| Sage Junction to Rexburg |
| Sage Junction to Dubois |
| Salmon to Montana Line |
| Swan Valley to Wyoming Line |
| Teton to Tetonia |
| Tetonia to Victor |