The O’neil Pass Trail travels through the southeastern corner of Olympic National Park. It is a trail segment that sits well within the backcountry so you must hike a considerable distance to reach the start of this trail.
At its southern terminus it connects to the upper Duckabush River Trail. From here it travels in a rough horseshoe shape, climbing westward up and over O’neil Pass before trending northeast to end at a junction with the East Fork Quinault River Trail. Views from the pass include Mount Anderson, Mount Steel and Mount Duckabush.
Because of its central location, the O’neil Pass Trail can be reached via the West Fork Dosewallips River Trail, the Duckabush River Trail, and the East Fork Quinault River Trail.
This area makes for a good backpacking adventure due to the variety of trails in the area that can be combined with O’neil Pass to form loops.
Two wilderness camps along the trail, at Marmot Lake and Upper Duckabush are good options for overnights. You must obtain a backcountry permit from Olympic National Park to spend the night at either camp.