The Duckabush River trail spans two land management agencies -- the US Forest Service and the National Park service. The first 6.2 miles of the trail weaves through Olympic National Forest. It's a popular early season backpack and a frequent site for WTA work crews. The upper section, in Olympic National Park, melts out much later, but provides a gateway to gorgeous backpacking destinations.
At 6.2 miles, hikers reach the boundary with Olympic National Park. It's 16.1 miles from here to O'Neil Pass, with nearly 3500 feet of elevation gain on the way there. Along the way, you'll pass the the LaCrosse Basin junction and continue on the Upper Duckabush.
About a mile from the intersection with LaCrosse Pass you will arrive at the end of the Duckabush Trail. There are a variety of options from here: Hart Lake, Marmot Lake, or even further on, down into Enchanted Valley via Anderson Pass.