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Idaho Transportation Department Highway Info |
US 12 | 1 mountain pass |
I-15 | 2 mountain passes |
US 20 | 2 mountain passes |
ID 21 | 4 mountain passes |
ID 28 | 1 mountain pass |
ID 29 | 1 mountain pass |
US 30 | 3 mountain passes |
ID 31 | 1 mountain pass |
ID 33 | 1 mountain pass |
ID 36 | 1 mountain pass |
ID 38 | 1 mountain pass |
ID 55 | 1 mountain pass |
ID 71 | 1 mountain pass |
ID 75 | 1 mountain pass |
I-84 | 1 mountain pass |
ID 87 | 1 mountain pass |
US 89 | 1 mountain pass |
I-90 | 2 mountain passes |
US 93 | 3 mountain passes |
US 95 | 3 mountain passes |