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This hike is a real alpine treat, with easy walking along a beautiful fast-flowing creek with waterfalls, surrounded by mountains.
As long as you can survive the very steep but short descent from the highway and the initial creek crossing to reach the main trail, then the rest of the hike is a walk in the park.
The 'international' aspect of the hike is because the route starts on the Canadian side of the border and then crosses into the United States.
Since the views don't change too much along the route you can easily make this a shorter or longer hike.
If you add another 1 km (one way) you can look over into the next valley towards the Chilkoot Trail.