The Highline Loop in Glacier National Park begins from the north side of the Going-to-the-Sun Road at Logan Pass. Although this hike includes the word “Loop” in its name, this is actually a one-way hike. The “Loop” refers to a bend in the road on the west side of the park where this hike ends. The best way to do this hike is to park at The Loop, located 13.1 miles east of the McDonald Lodge on the Going-to-the-Sun Road, and then take the free shuttle up to Logan Pass.
The Highline Trail is an extremely popular hike; and for good reason. At every step, and every turn, hikers will enjoy spectacular scenery as the Highline follows along the Continental Divide, also known as the Garden Wall throughout this section of Glacier National Park. The exceptionally beautiful views, the excellent opportunities for spotting wildlife, and the wildflowers, all combine to make this a hike you’ll remember the rest of your life. If you’re looking for solitude, however, you won’t find it on this trail.
At roughly one-quarter of a mile from the trailhead hikers will arrive at the famous ledge with the reputation for terrifying those with a fear of heights. In most places the ledge, hanging like a shelf along the Garden Wall, is only six to eight feet in width, and has drop-offs of roughly one hundred feet or more down to the Going-to-the-Sun Road below. This segment lasts for only three-tenths of a mile, but may seem forever if you have a fear of heights. Fortunately Glacier National Park has installed a hand cable along this stretch of the trail. My advice is to not let this deter you, as this is one of the most scenic hiking trails in America.
More: http://www.hikinginglacier.com/highline-loop.htm
