How many miles is the Kancamagus Highway? This question can be tricky and many online sources have it wrong. The Kancamagus Highway is also called Rt. 112, Rt. 112 itself is much longer. The correct question is how long is the Kancamagus Scenic Byway. The Kancamagus Scenic Byway is 34-1/2 miles from beginning to end. […]