Rating: 
Difficulty: Difficult (for young kids) - but so worth it
Getting There: Oneonta Gorge is situated on the Scenic Highway 3 miles east of Multnomah Falls. From I-84 eastbound take exit #28 Bridal Veil and continue 5.2 miles to Oneonta trailhead. From I-84 westbound or eastbound, take exit #35 Scenic Highway and continue west 1.9 miles to Oneonta.
Imagine a trip through a narrow canyon, wading along through a stream, scrambling over rocks and logs and reaching a hidden waterfall.
And it all waits for you at Oneonta Gorge.
This is a great challenge with a fun reward for all the family. Come prepared to get wet, wet, wet and bring a change of clothes. This narrow gorge right off the Old Columbia River Highway has a lot to offer in a short hike.
It is best to do this late in the summer when the Oneonta river is low (August is great), so you can easily wade through the stream as you get closer to the waterfall. The hike starts out by descending a small set of very steep stairs and you walk along a little bit of the river as you head to the narrow canyon. Now for the hard section as you scramble over some big boulders and logs (young kids will need help -- we did it with two five year olds).
Once over the big boulders though it is a fun wade through the stream to the waterfall.
If you want to stay dry at all -- don't even try this one!
Also - we brought our 10 year old dog with us -- and it wasn't too much fun for him trying to get over big boulders and through the logs. So my recommendation is to keep the dog at home.
A note for non-summer visitors -- I don't recommend doing this when the river is high but even without climbing the boulders the kids can have lots of fun playing in the river after you descend the steep stairs.