Ponytail Falls is one of the “hidden” waterfalls in the Columbia River Gorge, considering that you can not directly view Ponytail Falls from the road. There’s a moderately steep hike involved with visiting this waterfall.
Ponytail Falls is on the same river as Horsetail Falls, and is sometimes called Upper Horsetail Falls. Horsetail Falls is directly viewed from the road. If you’re in the Horsetail Falls area, visit Ponytail Falls also, though the hike is somewhat steep. I don’t think it was awful, but I had already tired myself out hiking or trying to hike to other “hidden” falls. Of the falls not viewable from the road, this is one of the more accessible ones. Everything’s relative, though!
1) From I-84, get onto the Columbia Gorge scenic highway.
2) Head west on the highway to Horsetail Falls, which is west of Multnomah Falls.
3) From the parking lot where you view Horsetail Falls, take the trail that leads to Ponytail Falls.
4) I think the trail is only 0.5 miles long, but it is steep, so it does seem longer.
Where in the World is Ponytail Falls?: map