Lower Oneonta Falls is one of my favorite waterfalls in the Columbia River Gorge. It is located on the Oregon side about 2.2 miles east of Multnomah falls on the East Historic Columbia River highway. ( 45 minutes east of Portland, Oregon on I-84 ) Lower Oneonta is accessible by scrambling up the Oneonta Creek bed in a slot / canyon. You will probably want to visit this waterfall during the summer months when the water levels in Oneonta creek are lower. You will need to scramble over two large log piles ( may vary ) as well as wade through water in one or two spots that is up to four feet. ( depends upon the amount of rain fall and season ). If you are with young children or older relatives, this is probably not the waterfall to visit, but you can easily visit many other waterfalls that are a only a few hundred meters from the historic Columbia river highway.
You can also catch glimpses of Lower Oneonta Falls from Oneonta Trail #424 and Horsetail Falls Trail #438 which join very close to the falls.
If you want to plan a trip to visit other water falls in the Gorge, you can visit
If you want to view a high resolution panorama of Latourell falls, then http://www.stoneyphoto.com/latourell-falls-columbia-river-gorge-oregon/