This is the first hike I take people on when they visit Oregon. If you're looking for an easy hike (only about 2 miles round trip) with a stunning waterfall half way through, this is the hike for you.
The Columbia River Highway splits around exit # 40 that leads to the Bonneville Dam. The parking and access area for Wahclella Falls is slightly down the hill and to the right (for eastbound traffic) of the entrance to the dam.
A Northwest Forest Pass is required if you park at the trailhead.
You can purchase a day pass for $5.