While flow may run dry in the late season, Curly Creek Falls is unique in having two natural basalt arches apparent at the top of the waterfall.

[1] Curly Creek Falls is located north of Interstate 84 in the heart of the Mount St. Helens National Volcanic Monument.

The area around the waterfall is surrounded by moss-covered rocks and a forest of old-growth Douglas fir and hemlock.

Access is found across the road to a parking area and the trailhead on the south shore of Lewis River.

Just upstream of the arches, the bedrock has a unique hollow cavity recognized as a keeper hole for those who visit the river for canyoning and rappelling the waterfall.