If you don't have the time to hike or run the entire length of the Upper Reach of the Deschutes River Trail (roughly 14 miles there-and-back), there are numerous points off of Conklin Road that provide shorter access the river. If your time is limited, the walk to Dillon Falls should be on the top of your list.
Dillon Falls isn't the quintessential horesetail-shaped waterfall you might see in the Columbia River Gorge. Rather, these falls are a powerful series of rapids dropping roughly 65 feet over one-third of a mile, with its tallest drop at a modest 8 feet. However, with an average flow of 1,500 cubic feet per second, it disposes of 10 times more water than Multnomah Falls and twice as much as Snoqualmie Falls, Washington's most popular cascade.